ACT Geometry Formulas

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Important formulas and information for the Math section on the ACT

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14 Terms

1
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Circle

Area= pie*r²

Circumference= 2*pie*r

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Triangles

Area= 1/2*bh

Perimeter= sum of the side lengths

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Pythagorean Theorem

Only for right triangles

a²+b²=c²

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sin(theta)

opp./hyp.

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cos(theta)

adj./hyp.

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tan(theta)

opp./adj.

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csc(theta)

1/sin

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sec(theta)

1/cos

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cot(theta)

1/tan

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Trapezoids

A=1/2*h (b1 + b2)

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Surface Area of a Rectangular solid

S= 2(lw+lh+wh)

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Surface Area of a cube

S=6s²

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Volume of a cube

V=s²

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Volume of a rectangular solid

V=lwh