ACT Formulas and notation

Front

Standard form of a line equation:

Back

Ax + By = C

A, B, and C are constants, where A ≠ 0 or B ≠ 0.

Front

Slope-intercept form of a line equation:

Back

y = mx + b

m = slope, b = y-intercept.

Front

What is the formula for point-slope form?

Back

y - y₁ = m(x - x₁)

m = slope, (x₁, y₁) and (x₂, y₂) are two points.

Front

Slope is calculated using two points: (x₁, y₁) and (x₂, y₂).

What is the formula for slope:

Back

Front

General form of a quadratic equation:

Back

ax² + bx + c = 0

a, b, and c are constants, where a ≠ 0.

Front

What is the quadratic formula and what does it tell us?

Back

Front

The formula to find the measure of each angle in a regular polygon.

Back

Front

Sum of degree measures in a polygon

Back

180(n - 2)

n = number of sides of the polygon.

Front

Center-radius form of a circle equation

Back

(x - h)² + (y - k)² = r²

(h, k) = center, r = radius.

Front

Area of a circle

Back

A = Π r²

A = area, r = radius, pi =approx 3.14.