Geometry Formulas
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Last updated 7:26 PM on 3/21/26
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12 Terms
1
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Circle Area Formula
πR²
2
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Circle Circumference Formula
2πR
3
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Square/Rectangle/Parallelogram Area Formula
BH
4
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Rectangle Diagonal Length Formula
√(L² + W²)
5
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Formula to find h, the height
a * sin(A or C)
6
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Trapezoid Area Formula
½(b1 + b2)h
7
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Formula for Trapezoid Altitude(height)
d * sin (A) or c * sin(B)
8
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Formula for Hypotenuse
√(base² + alt²)
9
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Formula for Area of an Equilateral Triangle
¾ * side²
10
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Formula for the Height of an Equilateral Triangle
(side * √3)/2
11
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Heron’s Formula
√(s(s-a)(s-b)(s-c)), s = (a + b + c)/2
12
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Formula for Radius
(a + b - c)/2
