Verified answer

cylinder V = πr²h = π(3)²(8) in cubic mm

Find the volume. Use 3.14 for π and the cylinder is 6mm across the top 8mm around the side.?

The volume of a cylinder is the area of the circular base times the length of the side (or height of the cylinder)

Area of circle = π * r^2

6 mm is diameter, so radius = ½ * 6 = 3 mm

Area of circle = π * 3^2 = π * 9

8 mm around the “circular” side is the circumference = 2 * π * r

You need the length of the side or height of the cylinder/

If 8 mm is the length of the side:

Volume = π * 9 * 8 = π * 72 = 72 * 3.14

72pi mm^3 <<<<<<<

Volume=3.14159*R^2*length.

Certainly, you can do the arithmetic.