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)(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 = Number of sides and S = length from center to a corner


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