ACT MATH FORMULAS

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20 Terms

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Pythagorean theorem

a² + b² = c²

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Percent increase/decrease

Difference between the numbers/original number

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Perimeter

The sum of the sides

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Circumference

2 pi r

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Square

S²

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Rectangle

LW

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Triangle

½ bh

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Circle

Pi r²

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Rhombus/parallelogram

Bh

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Trapezoid

1/2h (b1+b2)

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Cube

S³

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Box

Lwh

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Cylinder

Pi r² h

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Sin

Opp/hypp

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Cos

Adj/hyp

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Tan

Opp/adj

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Csc

1/Sin

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Sec

1/cos

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Cot

1/Tan

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Standard form of a circle

(x-h)² + (y-k)²

r= radius

(h, k) = center “Opposite signs”