Question

The ball of a float value is a sphere 200mm in diameter. Calculate the volume and surface area of the ball

Answer 1

A=4πr^2=4·π·100^2≈1.25664×10^5

V=4/3π r ^3=4/3·π·100^3≈4.18879×10^6

Answer 2

I would be inclined to do it in meters though
r = 0.1 meter