Area Formulas for 2D Shapes
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A semicircle is...
1/2 of a circle.
A quarter circle is...
1/4 of a circle.
Trapezoid Formula
A = 1/2(b1+b2)h A = (1/2)*(base 1 + base 2)*height
Triangle Formula
A = 1/2bh A = (1/2)*base*height
Parallelogram Formula
A = bh A = base*height
Rectangle Formula
A = lw A = length*width
Circle Formula
A = πr^2 A = pi*(radius^2)
Square Formula
A= side*side A = (side)^2
