The surface area of the sides of a right cylinder can be found by multiplying twice the number pie by the radius times the height. If a circular cylinder has radius (r) and height (h), write an expression that represents the surface area of its size.

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To find the surface area of the sides of a right cylinder, we need to calculate the area of the curved side. The formula for the surface area of the sides of a cylinder is given by:

Surface Area of Sides = 2πrh

Where:
π is a mathematical constant approximately equal to 3.14159
r is the radius of the cylinder
h is the height of the cylinder

Therefore, the expression that represents the surface area of the sides of a given circular cylinder with radius (r) and height (h) is:

2πrh