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Perimeter of a rectangle
A = 2l + 2w or 2(l + w)
If Length = 4 and width = 6

Perimeter of a square
A = 4s

Area of a triangle
A = (1/2)bh

Area of a rectangle
A = bh or lw

Area of a square
A = S^{2}

Diameter of a circle
d = 2r

Circumference of a circle
C = 2πr or πd

Area of a circle
A = πr^{2}

Volume of rectangular solids
V = lwh

Pythagorean theorem
a^{2} + b^{2} = c^{2}

Average of a set of numbers: Average
Sum of the numbers ÷ The amount of numbers in the set
Average of 2, 5, 6, 3, 4
Average = 2+5+6+3+4 / 5 = 20/5 = 4


The sum of the interior angles of a triangle is
180°

The sum of the interior angles of a quadrilateral is
360°

Complementary angles add up to
90°

Supplementary angles add up to
180°



1 meter =
100 centimeters

1 kilometer =
1,000 meters




1 quart =
2 pints or 4 cups



Commit the order of operations to memory: Think of PEMDAS and you'll be set.
Parentheses, Exponents, Multiplication, Division, Addition, Subtraction

