List of formulas in elementary geometry

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This is a short list of some common mathematical shapes and figures and the formulas that describe them.

Two-dimensional shapes[edit]

Shape Area Perimeter/Circumference
Square (where is the length of a side)
Rectangle ( is length, is width)
Circle (where is the radius and is the diameter) or
Ellipse (where is the semimajor axis and is the semiminor axis)
Triangle ( is base; is height; are sides)
Parallelogram ( is base, is height, is side)
Trapezoid (where and are the bases)

Three-dimensional shapes[edit]

Shape Volume Surface area
Cube (where is the length of a side)
Rectangular Prism ( = length, = height, = width)
Sphere (where is the radius)
Right circular cylinder (where is the radius and is the height)