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Total angle measure of n sided polygon
180(n2)

Area of equilateral triangle
A=

Ratio of the sides for a 306090 triangle is

Perpendicular lines have negative slopes

y= mx +b
x intercept = b/m
y intercept = b
slope m= (y2y1)/(x2x1)
b can be found by substituting the points in the eq y=mx+b.

If (x1,y1) and (x2,y2) are two points on a line, then the slope of the line is
(y2y1)/(x2x1)

Ratio of the side1:side2:hyp for a 454590 triangle is

