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Back to Areas Related to Circles

Class 10 · Mathematics (Standard) · Unit 11: Areas Related to Circles

Basics of a Circle

Lesson 1 of 6

For a circle of radius

r

: circumference

C = 2\pi r

, area

A = \pi r^2

. Diameter

d = 2r

.

\pi

is the ratio

C/d

and equals approximately

22/7

or

3.14

.

Sector of a Circle

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