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Perimeter of a rectangle
A = 2l + 2w or 2(l + w)
If Length = 4 and width = 6
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Perimeter of a square
A = 4s
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Area of a triangle
A = (1/2)bh
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Area of a rectangle
A = bh or lw
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Diameter of a circle
d = 2r
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Circumference of a circle
C = 2πr or πd
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Volume of rectangular solids
V = lwh
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Pythagorean theorem
a2 + b2 = c2
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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
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The sum of the interior angles of a triangle is
180°
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The sum of the interior angles of a quadrilateral is
360°
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Complementary angles add up to
90°
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Supplementary angles add up to
180°
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1 meter =
100 centimeters
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1 kilometer =
1,000 meters
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1 quart =
2 pints or 4 cups
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Commit the order of operations to memory: Think of PEMDAS and you'll be set.
Parentheses, Exponents, Multiplication, Division, Addition, Subtraction
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