This document provides definitions and formulas related to circles. It defines a circle as the locus of points equidistant from a given center point. It then defines key circle terms like circumference, diameter, radius, chord, arc, and semicircle. For each term it provides a definition and any related formulas, such as the circumference formula C=2πr and the area formula A=πr^2. The document concludes by thanking the reader.

1. St. thomaS training
college
Submitted by,
Priya P Nair
Reg no:18014386006
Mathematics Optional
Year:2015-2016

2. Welcome

3. introDUction to circleS

4. Circle is the locus of points equidistant
from a given point, the center of the circle.
circle

5. Distance around a circle is called
circumference.
C =2πr
CIRCUMFERENCE

6. DIAMETER OF ThE CIRCLE
A line segment joining any two points on the
circle and that passes through its centre is
called a diameter.
d= 2r, where r is radius of the circle

7. RADIUs OF ThE CIRCLE
The radius of a circle is the distance from the
center of a circle to any point on the circle.
Infinite number of radii can be drawn in a
circle

8. ChORD OF ThE CIRCLE
A line segment joining any two points on the
circle is called a chord.
Diameter is also a chord of the circle.
Diameter is the longest chord of the circle.

9. ARC OF THE CIRCLE
An arc is the distance between any two point
on the circumference of a circle.

10. SEMICIRCLE OF A CIRCLE
A semicircle is a half circle, formed by cutting a whole
circle along a diameter line
Any diameter of a circle cuts it into two equal
semicircles.
e circle.

11. AREA OF A CIRCLE
 The area of a circle is π times the square of
the radius
 A = πr2

12. POInTS TO dISCuSS
Circle features
Diameter and radius
Chord
Arc
Area of the circle

13. THANK YOU