Maths lecture slides Grade 6 Unit: Angle

2. o Name: Prachi A. Parab
o Roll No: 46
o Class: B.Ed (2014-15)
o Methods: Economics & Mathematics
o Subject: Mathematics
o Std: 6
o Unit: Angle
Pandit Rajpati Mishra College Of Education & Research

3. Contents
• Introduction
• Rays, Vertex & Angle
• Naming an Angle
• Measuring an Angle
• Interior and exterior of an Angle
• Types of Angles

4. Let’s See Who Can Answer This 
• Name the different types of Shapes.
• Split the word “TRIANGLE” in 2 parts.

5. When two RAYS meet at a point(VERTEX),
an ANGLE is formed.

7. MEASURING AN ANGLE

8. INTERIOR & EXTERIOR OF AN ANGLE

9. “Hi! We’re the Angles, we’re one family, but all
very different, so let us tell you a bit about
ourselves!”

10. This is Obtuse. He’s the
husband of the family. He’s
bigger than Right and
Acute . He’s always inside,
and he always measures
between 90° and 180°
(depending on how much
dinner he’s eaten!)
MR. OBTUSE ANGLE

11. OBTUSE ANGLE

12. Mrs. Right Angle
This is me. I’m Mrs.
Right Angle. I always
measure 90°, my
favourite shape is a
square, and what’s
more, no matter what
my husband tells you,
I’m always right!

13. RIGHT ANGLE

14. Baby Acute Angle
This is baby Acute angle.
Isn’t he cute?! He loves a
hug, and always has his
arms out for cuddles! He’s
the smallest of the family,
measuring less than 90°.

15. ACUTE ANGLE

16. RECAPITULATION
• When 2 rays meet at a point (Vertex), an Angle is formed.
• We name angles using the vertex and other letters around it and the
vertex letter always goes in the center.
• Measuring unit of an angle is DEGREE
• When the points are on the arms of the angle they belong to the angle
whereas when they are in the interior and exterior of the angle they
don’t belong to the angle.
• Acute angle measures less than 90 degrees, Right Angle measures
exactly 90 degrees, Obtuse angle measures more than 90 degrees and
less than 180 degrees.

17. So, Today We Learnt About
Rays, Vertex &
Angle
How to measure
an angle
How to name
an angle
Interior &
Exterior of an
angleAcute, right
and obtuse
angles

18. Evaluation
o Which points below are in the interior and exterior of the
angle?
o Each picture below represents an angle. Name the angle.

19. Assignment:
Identify, Name & Measure the ANGLES
below

20. References
• Mathematics text book grade 6
• Images- www.google.com
• The Angles Family (Georgina Reynolds)
http://www.primaryresources.co.uk/maths/mathsE7.htm
• http://www.teachingideas.co.uk/maths/contents_angles.htm