Area = p × radius^{2}; p is approximately equal to 3.14.

PERIMETER of a:

square

Perimeter = 4 × side

rectangle

Perimeter = 2 × length + 2 × width

triangle

Perimeter = side_{1} + side_{2} + side_{3}

CIRCUMFERENCE of a circle

Circumference = p × diameter; p is approximately equal to 3.14.

VOLUME of a:

cube

Volume = edge^{3}

rectangular solid

Volume = length × width × height

square pyramid

Volume = ^{1}/_{3} × (base edge)^{2} × height

cylinder

Volume = p × radius^{2} × height; p is approximately equal to 3.14.

Cone

Volume = ^{1}/_{3} × p × radius^{2} × height; p is approximately equal to 3.14.

COORDINATE GEOMETRY

distance between points = ; (x_{1}, y_{1}) and (x_{2}, y_{2}) are two points in a plane.slope of a line = ; (x_{1}, y_{1}) and (x_{2}, y_{2}) are two points on the line.

PYTHAGOREAN RELATIONSHIP

a^{2} + b^{2} = c^{2}; a and b are legs and c the hypotenuse of a right triangle.

MEASURES OF CENTRAL TENDENCY

mean = , where the x‘s are the values for which a mean is desired, and n is the total number of values for x.median = the middle value of an odd number of ordered scores, and halfway between the two middle values of an even number of ordered scores.