Question

The formula for the area a of a circle of radius r is

Answer 1

Answer:

$let \: radius \: be \: \: \: r$

$so \: the \: area \: of \: circle \: is \: miven \: by \: \pi \: r ^{2}$

$and \: the \: \pi \: has \: a \: approx \: value \: = 3.14 \: \: \: \: ( \frac{22}{7} )$

$so \: the \: area \: is \: = 3.14r ^{2}$

Answer 2

area of a circle whose radius is r = πr^2

the value of π is 3.14 and 22/7

so

area of circle= 3.14 r^2