ACT Math Formulas

Front

What is the formula for the area of a circle?

Back

A = π r²

Front

What is the distance formula in a coordinate plane?

Back

d = \sqrt{(x_2 - x_1)² + (y_2 - y_1)²}

Front

How do you calculate the perimeter of a polygon?

Back

Add all the sides together.

Front

What is the formula for the area of a triangle?

Back

A = ½bh

Front

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

Back

y = mx + b

Front

What is the formula for the volume of a rectangular prism?

Back

V = lwh

Front

What is the Pythagorean theorem?

Back

a² + b² = c², where c is the hypotenuse.

Front

What is the formula for the area of a rectangle?

Back

A = lw

Front

What is the formula for the circumference of a circle?

Back

C = 2πr or C = πd

Front

What is the formula for the area of a trapezoid?

Back

A = ½(a + b)h, where a and b are the lengths of the bases.