Question

if the radius of a circle is doubled then it's area will be​

Answer 1

Answer:

if the radius of a circle is doubled then it's area will be increased

Answer 2

We know the area of a circle is πr^2 where r is the radius. If the radius is doubled, say, the radius is r1 , then r1= 2r. The area of the second circle will be π(2r)^2., which is 4πr^2.So, the area will be increased by four times to that of the first one.

According to the formula, if we double (replace r with 2r) then we get , which means the area quadrupled.