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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 = a2
Rectangle

P = 2a+2b
A = ab
Parallelogram

P = 2a+2b
A = bh
Trapezoid

P = a+b+c+d
A = 12h(a+b)
Triangle

P = a+b+c
A = 12bh
Circle

C = 2πr
A = πr2