Question

What is the volume of a cylinder with a 8 inch diameter and 6.2 inch height

Answer 1

To find the volume of a cylinder you need to know the height and radius. 
You already know the height and the radius equals half of the diameter so that will be 4.

Formula for cylinder volume: πr²h
=3.14×4²×6.2
=3.14×16×6.2
=311.488 in³