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# 7MA_Formulas

### Math Formulas

Perimeter of a Rectangle P = 2l + 2w or P = 2(l + w)
Perimeter of a Polygon Sum of all sides
Circumference of a Circle C = 2πr or C = πd
Area of a Triangle A = 1/2bh or A = bh/2
Area of a Circle A = πr to the 2nd power
Area of a Square A = s to the 2nd power
Area of a Rectangle A = lw or A = bh
Area of Parallelogram Base x height
Area of a Trapezoid A = 1/2(a+b)h
Volume of a cylinder V = πr to the 2nd power times h
Surface Area of a Cylinder S = 2πrh + 2πr to the 2nd power or S = 2πr(h + r)
Volume of a rectangular prism V = (L)(W)(H)
Surface Area of a Rectangular Prism 2(LW + LH + WH)
Percent Change Difference divided by Decimal (difference/original \$ = percent change)
Simple Interest Interest = percent x rate x time I= (\$) x (%) x (years)
Ratio for probability Desire divided by total
Rational Numbers numbers that can be written as a ratio or fraction ("all frats are rats")
Irrational Numbers Cannot be written as a ratio or a fraction (no bar, no pattern) Example: π - Pi
Scientific Notation a way to easily handle very large numbers or very small numbers (ex: 0.0000000056 = 5.6 x 10 to the -9 power)
Midpoint Value x1 + x2/2, y1 + y2/2 (subscript↓)
Complementary Angles either of two angles whose sum is 90 degrees
Supplementary Angles either of 2 angles whose sum is 180 degrees
Translation slide
rotation turn
dilation multiply/enlarge/shrink
reflection flip
distance/rate formula d = r x t
distance between two points d=√(x2-x1)2 + (y2-y1)2 (subscript↓)
unit cost total cost/# of items or money/number
Slope intercept form y=mx + b
slope formula rise/run or y2-y1/x2-x1 (subscript↓)
Triangle sum theorum a + b + c = 180
Exterior angle theorum angle A = the sum of 2 remote interior angles of a triangle
Pythagorean Theorum a2 + b2 = c2 (superscript↑)
Volume of a cube v = s3 (superscript) or V = L x W x H
Volume of a cone v = 1/3πr2h (superscript↑)
volume of a sphere v = 4/3πr3 (superscript↑)
volume of a pyramid v = lwh/3
surface area of a cube 6s squared
surface area of a cone a = πr squared + πrL
surface area of a sphere a = 4πr squared
Created by: ndmsteach