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Perimeter & Area
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Area = a2
Perimeter = 4a
Area = a × b
Perimeter = 2a + 2b
Area = h × b × 12
Perimeter = a+b+c
Area = r2 × π
Perimeter = 2πr
Area = b × h
Perimeter = 2a + 2b
Area = 12h(a+b)
Perimeter = a+b+c+d
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