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# Math Formulas

TermDefinition
Slope-Intercept Form y=mx+b m=slope b=y-intercept
Area of a Triangle 1/2 bh
Area of a Square or Rectangle l*w
Area of a Parallelogram b*h
Area of a Trapezoid 1/2 (a+b)h a=base b=top h=height
Interior Angle Sum of a Triangle 180
Interior Angle Sum of Quadrilaterals 360
Interior Angle Sum of Polygons (n-2)180 n=number of sides
Number of Diagonals n(n-3) 2
Circumference of a Circle 2 r distance around a circle
Diameter straight line drawn through the center of the circle which connects two opposite points on the circle's circumference
Radium half the diameter line from center to the circumference
Tangency Circles touch at exactly one point
Chord A line drawn through a circle that connects two points on the circle's circumference, but doesn't go through the center.
Area of a Circle
2 Right Triangle special angle ratios 45-45-90 (isosceles right triangle) 30-60-90
2 Right Triangle sides ratios 3-4-5 5-12-13
Isosceles Right Triangle sides ratios x, x, x 2
30-60-90 sides ratios x, x 3, 2x
Volume of Rectangular Solids lwh
Surface Area of Rectangular Solids 2lw+2lh+2wh
Diagonal Length of Rectangular Solids (l +w + h )
Volume of Cubes s s=side or lwh
Surface Area of Cubes 6s s=side or 2lw+2lh+2wh
Diagonal Length of Cubes s 3
Volume of Cylinders r h r=radius of circle h=height
Surface Area of Cylinders 2 r + 2 rh r=radius of circle h=height
Volume of Cones r=radius of circle h=height
Surface Area of Cones r=radius of circle l=length of side
Volume of Pyramids 1/3 bh b=area of the base h=height
Volume of Spheres
SOHCAHTOA Sine: Opp/Hyp Cosine: Ajd/Hyp Tangent: Opp/Adj
Tangent in relation to Sine and Cosine Tangent=Sine/Cosine
Difference of Square a -b = (a+b)(a-b)
Possible Combinations of Events # Element A * # Element B * # Element C . . .
Probability # of desired outcomes #of total possible outcomes
Probability of 2, mutually exclusive, outcomes both happening probability of A * probability of B
Circumference of a Circle Arc
Area of a Circle Arc
Arithmetic Sequence Explicit Formula a =nth term a =1st term d=common difference
Arithmetic Sequence Recursive Formula a =nth term a =1st term n=number of terms d=common difference
Find the Intersect of two lines Put both lines in slope-intercept form. Put them equal to each other to solve for x. Then solve for y.
Perpendicular Lines Slopes are negative reciprocals
Parallel Line Slopes are equal
Created by: Lachelle

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