Question

if the radius of a circle is doubled its area becomes ?

Answer 1

Let the radius of the circle is = r

Then the area of the circle = Ï€ r²

Now double radius = 2 r

Then the new area = Ï€ (2 r)²

= Ï€ × 4 × r²

= 4 (Ï€ r²)

If the radius of the sphere is double then the area will become four times.