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# Area Formulas

Rajiv Singh
11/09/2018 1 0

### Areas

square = a2

rectangle = ab

parallelogram = bh

trapezoid = h/2 (b1 + b2

circle = pi r 2

ellipse = pi r1 r2

triangle = (1/2) b h

equilateral triangle = (1/4)(3) a2

triangle given SAS = (1/2) a b sin C

triangle given a,b,c = [s(s-a)(s-b)(s-c)] when s = (a+b+c)/2 (Heron's formula)

regular polygon = (1/2) n sin(360°/n) S2
when n = # of sides and S = length from center to a corner

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