SSC CGL 9 Aug 2015 Shift 1 Paper

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Question : 119 of 200

Marks: +1, -0

If the area of a circle is A, radius of the circle is r and circumference of it is C, then

$A/r$ = C
rC = 2A
$C/A$ = $r/2$
AC = $r^2/4$

Solution:

A =

πr^2

C = 2πr
∴

A/C

=

{πr^2}/{2πr}

=

r/2

⇒ rC = 2A

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