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Area Formulas Reference
Rectangle
A = length x width
Circle
A = pi x r²
Triangle
A = 0.5 x base x height
Trapezoid
A = 0.5 x (a + b) x h
Heron's formula for triangles with three sides: s = (a+b+c)/2, then A = sqrt(s(s-a)(s-b)(s-c))
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