ACT Math Formulas

Geometry (3-D)

Rectangular Volume

V=lwh

Rectangular SA

SA=2lw+2lh+2wh

Diagonal Rectangular

Square root of l²+w²+h²

Cube Volume

s³

Cube SA

6s²

Diagonal Cube

s square root of 3

Cylinder Volume

pir²h

Cylinder SA

2pir²+pidh

Cones Volume

1/3pir²h

Cones SA

pir²+pirl

Pyramids Volume

1/3area of the base(h)

Spheres Volume

4/3pir³

Spheres SA

4pir²

Midpoint Formula

M = (x1+x2)/2 , (y1+y2)/2

Distance Formula

square root of (x2-x1)²+(y2-y1)²

Interior Angle Sum

(n-2)(180)

Individual Interior Angles

(n-2)180/n

Number of Diagonals

n(n-3)/2

Central Angle (Circles)

Arc = Thetha

Inscribed Angles (Circles)

Arc = 2(Thetha)

Intersecting Chords

a+b/2

Probability

Desired outcomes/all possible outcomes)

Either/or probability (increases chances)

outcome A/total number of outcomes + outcome B/total number of outcomes

Combined Probability

outcome A/total number of outcomes(outcome B/total number of outcomes)