Question

What is the surface area of a sphere with a radius of 20 m?

1,600π m2
800π m2
400π m2
200π m2

Answer 1

the formula of surface area of sphere= 4pi*r^2
radius=20 m
S.A=4*pi*20^2
S.A=4*pi*400
S.A=1600 pi m2
so the answer is a 1600 pi m2

Answer 2

SA=4pir^2
r=20m
SA=4pi20^2
SA=4pi400
SA=1600pi m^2