- The area of a circle is
, where*A*= π*r*^{2}*r*is the radius of the circle.

- The circumference of a circle is
, where*C*= 2π*r**r*is the radius of the circle. The circumference can

also be expressed as**π**, because the diameter is always twice the radius.*d*

- The area of a rectangle is
, where*A*=*lw**l*is the length of the rectangle and*w*is the width of the

rectangle.

- The area of a triangle is
, where*A*= ½*bh**b*is the base of the triangle and*h*is the height of the

triangle.

- The volume of a rectangular prism is
, where*V*=*lwh**l*is the length of the rectangular prism,*w*is

the width of the rectangular prism, and*h*is height of the rectangular prism.

- The volume of a cylinder is
, where*V*= π*r*^{2}*h**r*is the radius of one of the bases of the cylinder and*h*is the height of the cylinder.

- The perimeter is the distance around any object.

- The Pythagorean Theorem only applies to right angles and states that
*c*^{2}=*a*^{2}+*b*^{2}, where*c*is the hypotenuse of the triangle and*a*and*b*are two sides of the triangle.

- The following are angle measures and side lengths for Special Right Triangles:

- In an equilateral triangle, all three sides have the same length, and each of the angles equals 60°.

- In an isosceles triangle, two sides have the same length, and the angles opposite those sides are

congruent.

- The complete arc of a circle has 360°.

- A straight line has 180°.

- A prime number is any number that can only be divided by itself and 1.

- Squaring a negative number yields a positive result.

- To change any fraction to a decimal, divide the numerator by the denominator.

- If two numbers have one or more divisors in common, those are the common factors of the

numbers.

- To calculate the mean, or average, of a list of values, divide the sum of the values by the number

of values in the list.

- The median is the middle value of a list of numbers that is in either ascending or descending

order.

- The mode is the value that appears the greatest number of times in a list.

- A ratio expresses a mathematical comparison between two quantities. (1/4 or 1:4)

- A proportion is an equation involving two ratios. (1/4 =
*x*/8 or 1:4 =*x*:8)

- When multiplying exponential expressions with the same base, add the exponents.

- When dividing exponential expressions with the same base, subtract the exponents.

- When raising one power to another power, multiply the exponents.

Source: Benchprep.com

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