That depends on what you already know about it. Formulas are just relationships between what you do know and what you don't know. I can't tell you what formula to use until you tell me what you know.
Example:
If you know the volume of the cylinder and its radius, then Height = Volume / pi xradius2
If you know the area of the cylinder and its radius, then Height = Area / 2 x pi x Radius
If you know the volume and area of the cylinder, then Height = Area2 / 4 x pi x Volume
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L.A.= 2*pi*radius*height its not like finding the area of a rectangle. a cylinder is a 3-D shape and a rectangle is a flat shape
Area of a circle = (pi)r2 [Areacircle = pi time the radius squared.] Volume of a cylinder = (pi)r2h [Volumecylinder = pi times the radius squared times the height.] (This applies to a right circular cylinder. :)
using a protractor
pi * radius2 * height
that formula is base times height