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#### Perimeter & Area

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### Knowledge

Area (A) is measured in square units, perimeter (P) is measured in units, and circumference (C) is measured in units.

#### Square

P = 4a

A = a^{2}

#### Rectangle

P = 2a+2b

A = ab

#### Parallelogram

P = 2a+2b

A = bh

#### Trapezoid

P = a+b+c+d

A = *1**2*h(a+b)

#### Triangle

P = a+b+c

A = *1**2*bh

#### Circle

C = 2πr

A = πr^{2}