How do you calculate a cylinder perpendicular on the end of a cylinder?

a cylinder is a cone with a circle at the bottom and a wrapping

Volume = pi X r2 X height

no because perpendicular lines meet and form a right angle and as a cylinder is round, it can't.

The area of a cylinder is calculated like this You need the radius (half the width) of the circle face. Work out on your calculator 2 x pi (Sorry i couldn't find the pi symbol on computer) Then...

Volume of a cylinder = (area of its cross-section) x (its length) If the end is a circle, then the area of the cross-section = (pi) x (half the diameter)2 = (pi) x (radius)2 Then Volume = pi R2 L