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complementary angles
two angles that add together to equal 90

supplementary angles
two angles that add to equal 180
find the complement of the supplement of angle x
subtract angle x from 180 degrees and then subtract that answer from 90 degrees

sum of a convex polygon
(n-2)180 n = # of sides on the convex polygon

isosceles
two legs (two equal sides)

scalene
all sides are different

equilateral
all sides are equal