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# 8Ma_Formulas

### 8th Grade Math Formulas

Perimeter of a Square P = 4s
Perimeter of a Rectangle P = 2l + 2w or P = 2(l + w)
Circumference of a Circle C = 2πr or C = πd
What is Pi(π)? π = 3.14 or π = 22/7
Area of a Square A = s to the 2nd power
Area of a Rectangle A = lw or A = bh
Area of a Triangle A = 1/2bh or A = bh/2
Area of a Trapezoid A = 1/2(a+b)h
Area of a Circle A = πr to the 2nd power
Area of an Ellipse A = πab
Volume of a Prism V = Bh
Volume of a Cylinder V = Bh
Volume of a Pyramid V = 1/3Bh
Volume of a Cone V = 1/3Bh
Volume of a Sphere V = 4/3πr to the 3rd power
Surface Area of a Cube (total) S = 6s to the 2nd power
Surface Area of a Prism (lateral) S = Ph
Surface Area of a Prism (total) S = Ph + 2B
Surface Area of a Pyramid (lateral) S = 1/2Pl
Surface Area of a Pyramid (total) S = 1/2Pl + B
Surface Area of a Cylinder (lateral) S = 2πrh
Surface Area of a Cylinder (total) S = 2πrh + 2πr to the 2nd power or S = 2πr(h + r)
Pythagorean Theorem a to the 2nd power + b to the 2nd power = c to the 2nd power
Simple Interest Formula I = prt
1 kilometer 1000 meters
1 meter 100 centimeters
1 centimeter 10 millimeters
1 mile 1760 yards
1 mile 5280 feet
1 yard 3 feet
1 foot 12 inches
1 liter 1000 milliliters
1 gallon 4 quarts
1 gallon 128 fluid ounces
1 quart 2 pints
1 pint 2 cups
1 cup 8 fluid ounces
1 kilogram 1000 grams
1 gram 1000 milligrams
1 ton 2000 pounds
1 pound 16 ounces
1 year 365 days
1 year 12 months
1 year 52 weeks
1 week 7 days
1 day 24 hours
1 hour 60 minutes
1 minute 60 seconds
Created by: ndmsteach