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8th Grade Math Formulas

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