Question

the area of circle is given by a is equals to Pi r square where r is the radius. calculate the rate of increase of area with respect to radius​

Answer 1

Answer:

Area (A) of circle having radius (r) id given by,

A=πr

2

Differentiate above w.r.t. r

dr

dA

=2πr

Hence rate of change of area when radius r=2 cm is

=

dr

dA

∣

∣

∣

∣

∣

r=2

=2π(2)2=4π cm