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Circle Area Formula
πR²
Circle Circumference Formula
2πR
Square/Rectangle/Parallelogram Area Formula
BH
Rectangle Diagonal Length Formula
√(L² + W²)

Formula to find h, the height
a * sin(A or C)

Trapezoid Area Formula
½(b1 + b2)h

Formula for Trapezoid Altitude(height)
d * sin (A) or c * sin(B)

Formula for Hypotenuse
√(base² + alt²)

Formula for Area of an Equilateral Triangle
¾ * side²

Formula for the Height of an Equilateral Triangle
(side * √3)/2

Heron’s Formula
√(s(s-a)(s-b)(s-c)), s = (a + b + c)/2

Formula for Radius
(a + b - c)/2