This document defines key terms related to circles such as radius, chord, and diameter. It explains that a circle is a collection of points equidistant from the center point, and the radius is the line from the center to any point on the boundary. It also defines a chord as a line between two points on the circle boundary, and notes that the diameter passes through the center. Finally, it provides the Pythagorean theorem formula to calculate the length of a chord based on the radius and perpendicular distance from the center.

2. FOUSIYA A.
B.ED MATHEMATICS
REG.NO. 18014340003
F.M.T.C, MYLAPORE

4. Circle is a collection of all points which are equidistance
from a point

5. Radius is a line joining the center and any points on the
boundary of the circle.
Here ‘r’ is the radius of circle
r

6. Chord is a line joining any two points on the boundary
of a circle.
Here ‘l’ is the length of the chord.
l

7. The chord which passes through the center of the circle
is called Diameter.
A B
Here AB is the diameter

8. Length of the chord can be found out by using
Pythagoras Theorem.
r
l

9.  Here ‘d’ is the perpendicular distance from the center
to the chord.
d

10. Length of the chord=2√(𝒓 𝟐
-𝒅 𝟐)