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Glossary of basic math formulas

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distance formula
sq rt of (x1-x2)2 + (y1-y2)2
slope
change in y over the change in x
slope equation
y=mx+b
triangle inequality theorem
the length of one side of a triangle must be greater than the difference but less than the sum of the other two sides
3-4-5 triangle
5-12-13 triangle
30-60-90
pythagorean theorem
x:x(sq rt 3):2x
45-45-90
x:x:x(sq rt 2}
circumference
2(pie)r
length of an arc
(n/360)x2(pie)r
area of a circle
(pie)r(sqd)
area of a sector
(n/360)x((pie)r(sqd))

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