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FORMULAS FOR FIND AREA




Square =  a2

• Rectangle =  ab

• Parallelogram =  bh

• Trapezoid =  h/2 (b1 + b2)

• Circle =  π r 2

• Ellipse = π r1 r2

• Triangle = (1/2) b h

• Equilateral triangle =  (1/4)sqrt(3) a2
 
• Triangle given SAS =  (1/2) a b sin C

Triangle given a,b,c [sqrt][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 = Number of sides and S = length from center to a corner



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