SAT Math Formulas to Review

Vertical angles

Opposite angles with the same measure

Corresponding angles

angles in the same corner with the same measure

Total measure of angles

180 * (n-2)

Sum length rule

No 1 side of a triangle has a greater length than any of the other 2 sides combined

Similar Triangles

Angles are equal, sides are proportional

Mean

average

Median

The middle value in a data set (organized smallest to largest)

Mode

The number that appears with the most frequency

Standard deviation

Shows how spread out data is from the mean value - More spread out = higher standard deviation, less spread out = lower standard deviation

Area of a circle

πr²

Circumference of a circle

2πr

Arc length formula

2πr * (angle/360)

Sector area formula

πr² * (angle/360)

Equation of a circle

(x-h)² + (y-k)² = r²

Inscribed rectangle property

a²+b²=(diameter)²

Vertex form of an equation

y = a(x-h)² + k

Surface area of a rectangle

2lw + 2hl + 2wh

Discriminant

b² - 4ac

Discriminant > 0 

2 solutions 

Discriminant < 0 

0 solutions

Discriminant = 0 

1 solution

Sum of solutions

-b/a

Product of solutions

c/a

Formula for density

mass/volume

x-coordinate of Vertex of a parabola

-b/2a

Volume of a cylinder

πr²h

Surface area of cylinder

2πr + 2πr²

Volume of a cone

(1/3)πr²

Volume of a sphere

(4/3)πr³

Volume of a pyramid 

(1/3)lwh

Volume of a rectangular prism

lwh