ACT Math Formulas Part 2

What is the formula for the perimeter of a rectangle?

• @@P = 2(length + width)@@

• @@P = length + width@@

• @@P = 2(length - width)@@

• @@P = length * width@@

What is the quadratic formula?

• @@x = rac{-b \pm \\sqrt{b^2 - 4ac}}{2a}@@

• @@x = rac{-b \\pm \\sqrt{b^2 + 4ac}}{2a}@@

• @@x = rac{-b \\pm \\sqrt{b^2 - ac}}{a}@@

• @@x = rac{-b \\pm \\sqrt{b^2 - 4a}}{2c}@@

What is the slope-intercept form of the equation of a line?

• @@y = mx + b@@

• @@y = b + mx@@

• @@y = mx - b@@

• @@y = b - mx@@

What is the formula for the area of a triangle?

• @@A = rac{1}{2} imes base imes height@@

• @@A = base imes height@@

• @@A = rac{1}{3} imes base imes height@@

• @@A = base + height@@

What is a Pythagorean Triple?

• A set of three positive integers a, b, and c such that @@a^2 + b^2 = c^2@@

• A geometric figure with three sides

• A type of triangle with equal sides

• A sequence of numbers that adds up to a perfect square

What is the formula for the slope of a line given two points?

• @@m = rac{y_2 - y_1}{x_2 - x_1}@@

• @@m = rac{x_2 - x_1}{y_2 - y_1}@@

• @@m = y_2 - y_1 + x_2 - x_1@@

• @@m = rac{y_1 + y_2}{x_1 + x_2}@@

What is the formula for the circumference of a circle?

• C = 2πr

• C = πd

• C = 2r

• C = r^2

What is the formula for the volume of a cylinder?

• @@V = \\pi r^2 h@@

• @@V = 2 \\pi r h@@

• @@V = \\pi r^2 + h@@

• @@V = \\frac{1}{3} \\pi r^2 h@@

What is the formula for the area of a parallelogram?

• @@A = base \times height@@

• @@A = \frac{1}{2} \times base \times height@@

• @@A = base + height@@

• @@A = 2 \times (base + height)@@

What is the formula for the area of a rectangle?

• A = length + width

• A = length - width

• A = length × width

• A = length ÷ width