Question

if radius of a circle is increased by 20% its area will increase by _?

Answer 1

Answer:

Step-by-step explanation:

Let's say the radius of said circle is r

Then Area, A=πr^2

Now new Radius r'=r + 20/100r = 1.2r

New Area =πr'^2= π (1.2r)^2= 1.44πr^2

Difference in Area D = 1.44πr^2-πr^2 = .44πr^2

So Percentage wise that is

.44πr^2*100/πr^2=44%