1) The document discusses 10 theorems related to circles. Theorem 1 proves that equal chords of a circle subtend equal angles at the centre using congruent triangles.
2) Theorem 6 proves that the angle subtended by an arc at the centre is double the angle subtended by it at any point on the remaining part of the circle using angles on parallel lines.
3) Theorems 9 concludes that angles in the same segment of a circle are equal based on Theorem 6 and the definition of angles formed in a segment.
Areas related to Circles - class 10 maths Amit Choube
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This a ppt which is based on chapter circles of class 10 maths it is a very good ppt which will definitely enhance your knowledge . it will also clear all concepts and doubts about this chapter and its topics
this is about surface area and volume to help the students to do there projects or ppts and insure that u can also see this and make another like this so all the best of this ppt for who al cannot do on there own so enjoy this thing here .... and thanks for watching :) ..
Circle - Basic Introduction to circle for class 10th maths.Let's Tute
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Circle - Basics Introduction to circle for class 10th students and grade x maths and mathematics.Lets tute is an online learning centre. We provide quality education for all learners and 24/7 academic guidance through E-tutoring. Our Mission- Our aspiration is to be a renowned unpaid school on Web-World
Areas related to Circles - class 10 maths Amit Choube
Β
This a ppt which is based on chapter circles of class 10 maths it is a very good ppt which will definitely enhance your knowledge . it will also clear all concepts and doubts about this chapter and its topics
this is about surface area and volume to help the students to do there projects or ppts and insure that u can also see this and make another like this so all the best of this ppt for who al cannot do on there own so enjoy this thing here .... and thanks for watching :) ..
Circle - Basic Introduction to circle for class 10th maths.Let's Tute
Β
Circle - Basics Introduction to circle for class 10th students and grade x maths and mathematics.Lets tute is an online learning centre. We provide quality education for all learners and 24/7 academic guidance through E-tutoring. Our Mission- Our aspiration is to be a renowned unpaid school on Web-World
The presentation is about the Open Text Book Examination English material 2016-2017 class 9. It covers basic and important points from the material and can be used to revise before the exam. Thanks for viewing.Cheers.... :)
Introduction to graph of class 8th students. Find a new easy way to understand graph, histogram, double-bar graph, pie-chart etc....This ppt could lead to u a better picture of maths
brief description about the diversity of living organisms present on earth... this is actually based on a chapter included in NCERT curriculum in class 9th. may be helpful for the students...
Each organism in this world, whether it is a plant, an animal or a microorganism, is unique in itself. This uniqueness of individuals forms the basis of the diversity among the living organisms.
This presentation explores diversity in organisms. How are they classified and how are they studied.
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See the whole class 9 circle lesson explanation
with theorems and proofs
easy to understand proofs
very useful for understanding concepts of the angles, arcs and segment concepts.
Grade 9 (Alternate) Mathematics III - Learning Modules for EASE Program of DepEdR Borres
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Grade 9 (Alternate) Mathematics III - Learning Modules for EASE Program of DepEd
A compilation of Math III learning modules for EASE which can be alternate for Grade 9 Mathematics.
Free!
AN EQUATION WHICH CAN BE WRITTEN IN THE FORM OF ax+by+c=0 WHERE a,b and c ARE REAL NUMBERS.
YOU WILL GET TO KNOW HOW TO REPRESENT THE EQUATIONS IN A GRAPH.
Read| The latest issue of The Challenger is here! We are thrilled to announce that our school paper has qualified for the NATIONAL SCHOOLS PRESS CONFERENCE (NSPC) 2024. Thank you for your unwavering support and trust. Dive into the stories that made us stand out!
A Strategic Approach: GenAI in EducationPeter Windle
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Artificial Intelligence (AI) technologies such as Generative AI, Image Generators and Large Language Models have had a dramatic impact on teaching, learning and assessment over the past 18 months. The most immediate threat AI posed was to Academic Integrity with Higher Education Institutes (HEIs) focusing their efforts on combating the use of GenAI in assessment. Guidelines were developed for staff and students, policies put in place too. Innovative educators have forged paths in the use of Generative AI for teaching, learning and assessments leading to pockets of transformation springing up across HEIs, often with little or no top-down guidance, support or direction.
This Gasta posits a strategic approach to integrating AI into HEIs to prepare staff, students and the curriculum for an evolving world and workplace. We will highlight the advantages of working with these technologies beyond the realm of teaching, learning and assessment by considering prompt engineering skills, industry impact, curriculum changes, and the need for staff upskilling. In contrast, not engaging strategically with Generative AI poses risks, including falling behind peers, missed opportunities and failing to ensure our graduates remain employable. The rapid evolution of AI technologies necessitates a proactive and strategic approach if we are to remain relevant.
Synthetic Fiber Construction in lab .pptxPavel ( NSTU)
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Synthetic fiber production is a fascinating and complex field that blends chemistry, engineering, and environmental science. By understanding these aspects, students can gain a comprehensive view of synthetic fiber production, its impact on society and the environment, and the potential for future innovations. Synthetic fibers play a crucial role in modern society, impacting various aspects of daily life, industry, and the environment. ynthetic fibers are integral to modern life, offering a range of benefits from cost-effectiveness and versatility to innovative applications and performance characteristics. While they pose environmental challenges, ongoing research and development aim to create more sustainable and eco-friendly alternatives. Understanding the importance of synthetic fibers helps in appreciating their role in the economy, industry, and daily life, while also emphasizing the need for sustainable practices and innovation.
Palestine last event orientationfvgnh .pptxRaedMohamed3
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An EFL lesson about the current events in Palestine. It is intended to be for intermediate students who wish to increase their listening skills through a short lesson in power point.
Operation βBlue Starβ is the only event in the history of Independent India where the state went into war with its own people. Even after about 40 years it is not clear if it was culmination of states anger over people of the region, a political game of power or start of dictatorial chapter in the democratic setup.
The people of Punjab felt alienated from main stream due to denial of their just demands during a long democratic struggle since independence. As it happen all over the word, it led to militant struggle with great loss of lives of military, police and civilian personnel. Killing of Indira Gandhi and massacre of innocent Sikhs in Delhi and other India cities was also associated with this movement.
Introduction to AI for Nonprofits with Tapp NetworkTechSoup
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Dive into the world of AI! Experts Jon Hill and Tareq Monaur will guide you through AI's role in enhancing nonprofit websites and basic marketing strategies, making it easy to understand and apply.
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Personal development courses are widely available today, with each one promising life-changing outcomes. Tim Hanβs Life Mastery Achievers (LMA) Course has drawn a lot of interest. In addition to offering my frank assessment of Success Insiderβs LMA Course, this piece examines the courseβs effects via a variety of Tim Han LMA course reviews and Success Insider comments.
Embracing GenAI - A Strategic ImperativePeter Windle
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Artificial Intelligence (AI) technologies such as Generative AI, Image Generators and Large Language Models have had a dramatic impact on teaching, learning and assessment over the past 18 months. The most immediate threat AI posed was to Academic Integrity with Higher Education Institutes (HEIs) focusing their efforts on combating the use of GenAI in assessment. Guidelines were developed for staff and students, policies put in place too. Innovative educators have forged paths in the use of Generative AI for teaching, learning and assessments leading to pockets of transformation springing up across HEIs, often with little or no top-down guidance, support or direction.
This Gasta posits a strategic approach to integrating AI into HEIs to prepare staff, students and the curriculum for an evolving world and workplace. We will highlight the advantages of working with these technologies beyond the realm of teaching, learning and assessment by considering prompt engineering skills, industry impact, curriculum changes, and the need for staff upskilling. In contrast, not engaging strategically with Generative AI poses risks, including falling behind peers, missed opportunities and failing to ensure our graduates remain employable. The rapid evolution of AI technologies necessitates a proactive and strategic approach if we are to remain relevant.
2. The collection of all the points in a plane, which are at a
fixed distance from a fixed point in the plane, is called a
CIRCLE.
3.
4. THEOREM 1
To Prove: Equal chords of a circle subtend equal; angles at
the centre.
Proof : We are given two equal chords AB and CD of a
circle with centre O. We want to prove that:
β AOB = β COD.
In triangles AOB and COD,
OA = OC (Radii of a circle)
OB = OD (Radii of a circle)
AB = CD (Given)
Therefore, Ξ AOB β Ξ COD (SSS rule)
This gives β AOB = β COD (CPCT)
5. THEOREM 2
If the angles subtended by the chords of a circle at
the centre are equal, then the chords are equal.
Theorem 2 is converse of the Theorem 1.
7. THEOREM 4
TO PROVE: The line drawn through the centre of a circle to
bisect a chord is perpendicular to the chord.
PROOF: Let AB be a chord of a circle with centre O and O is
joined to the mid-point M of AB. We have to prove
that OM β₯ AB. Join OA and OB.
In triangles OAM and OBM,
OA = OB (Given)
AM = BM (Given)
OM = OM (Common)
Therefore, ΞOAM β ΞOBM (SSS)
This gives β OMA = β OMB = 90Β° (CPCT)
8. THEOREM 5
There is one and only one circle passing
through three given non-collinear points.
9. THEOREM 6
TO PROVE: Equal chords of a circle (or of congruent circles) are
equidistant from the centre (or centers).
PROOF: Take a circle of any radius.
Draw two equal chords AB and CD of it and also the
perpendiculars OM and ON on them from the centre O.
Divide the figure into two so that D falls on B and C falls
on A.
We observe that O lies on the crease and N falls on M.
Therefore, OM = ON.
10. THEOREM 7
Chords equidistant from the centre
of a circle are equal in length.
Theorem 7 is converse of the
Theorem 6
11. THEOREM 6
TO PROVE: The angle subtended by an arc at the centre is double the angle subtended by it at any
point on the remaining part of the circle.
PROOF: Given an arc PQ of a circle subtending angles POQ at the centre O and PAQ at a point A on the
remaining part of the circle.
Consider the three different cases arc PQ is minor(Fig 1), arc PQ is a semicircle(Fig 2) and in arc PQ is
major(Fig 3).
Let us begin by joining AO and extending it to a point B.
In all the cases, β BOQ = β OAQ + β AQO because an exterior angle of a triangle is equal to the
sum of the two interior opposite angles.
In Ξ OAQ,
OA = OQ (Radii of a circle)
Therefore, β OAQ = β OQA
This gives β BOQ = 2 β OAQ (1)
Similarly, β BOP = 2 β OAP (2)
From (1) and (2), β BOP + β BOQ = 2(β OAP + β OAQ)
This is the same as β POQ = 2 β PAQ (3)
For the case (iii), where PQ is the major arc, (3) is replaced by reflex angle POQ = 2 β PAQ.
12. THEOREM 9
TO PROVE: Angles in the same segment of a circle are equal.
PROOF: According to Theorem 6, β PAQ = 1/2 β POQ = 1/2Γ180Β°=90Β°.
If we take any other point C on the semicircle, again we get
that β PCQ = 90Β°(Fig 1).
Suppose we join points P and Q and form a chord PQ in the
figures used in Theorem 6. Then β PAQ is also called the angle
formed in the segment PAQP.
A can be any point on the remaining part of the circle. So if we take
any other point C on the remaining part of the circle,
β POQ = 2 β PCQ = 2 β PAQ
Therefore, β PCQ = β PAQ.
13. THEOREM 10
If a line segment joining two points subtends equal
angles at two other points lying on the same side
of the line containing the line segment, the four
points lie on a circle (i.e. they are concyclic).
Theorem 10 is converse of the Theorem 9
14. Cyclic Quadrilaterals
A quadrilateral ABCD is called cyclic if all the four vertices of it lie on a circle.
If we observe these cyclic quadrilateral, we find that β A + β C = 180Β° and β B + β D
= 180Β°, neglecting the error in measurements.
We conclude that the sum of either pair of opposite angles of a cyclic
quadrilateral is 180Β°.
In converse of this,
We conclude that if the sum of a pair of opposite angles of a quadrilateral is 180Β°,
the quadrilateral is cyclic.