What is the volume of a sphere with diameter of 4 millimeters

The volume is 33.5mm^3 (or cubed)

Formula : v = 4/3πr^3 or v = 4 x 3.14 x (r x r x r) ÷ 3

~ 2 x 2 x 2 = 8  (we use 2 because the radius is half of the diameter)

v = 4 x 3.14 x 8 ÷ 3     a. Multiply everything together
v = 100.48 ÷ 3             b. Divide by 3
v = 33.493                   c. Round (if needed)
v = 33.5