Circumference
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Circumference typically refers to the distance around a circle, though it may refer to the distance around any closed curve like an ellipse, though calculating the circumference of an ellipse is moderately harder than calculating the circumference of a circle. The circumference of a circle is typically solved by 
where 
represents a circle's diameter, though 
certainly works as well.
Finding Area and Volume of a Prism
The volume of a prism is the area of the base face multiplied by the height. (If the prism is not a right prism, then the height is merely the perpendicular height from the base face.) The surface area of a prism is calculated by the sum of perimeter of the base face multiplied by the height of the prism and twice the area of a base face.
