Geometry Formulas

Front

Area of a square

Back

A = s^{2}

Front

Area of a rectangle

Back

A = lw

Front

Area of a parallelogram

Back

A = bh

Front

Area of a triangle

Back

A = \frac{1}{2} bh

Front

Area of a trapezoid

Back

A = \frac{1}{2} (b_{1} + b_{2})h

Front

Area of a circle

Back

A = \pi r^{2}

Front

Perimeter of a square

Back

P = 4s

Front

Perimeter of a rectangle

Back

P = 2l + 2w

Front

Perimeter of a triangle

Back

P = s_{1} + s_{2} + s_{3}

Front

Circumference of a circle

Back

C = 2\pi r \text{ or } C = \pi d