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common right triangles
 3,4,5
 5,12,13
 8,15,17
 7,24,25
 and their multiples





arcs
 congruent chords are equidistant from the center of the circle
 a diameter perpendicular to the chord bisects its arc and itself



locus
a set of all points that satisfy 1 or more conditions


ratio of perimeter,area,volume
 if the scale factor of 2 similar figures are a:b the
 ratio of perimeter is a:b
 ratio of area is
 ratio of volume is


pyramid
 la=1/2pl
 ta=la+b
 volume=1/3b*h

cylinder
 la=2(pi)rh=ph
 v=(pi)h=bh

cone
 la=1/2pl=(pi)rl
 v=1/3bh=1/3(pi)h

sphere
 a=4(pi)
 v=4/3(pi)




setting up coordinate proofs
 use as few letters as possible
 aviod using fractional/radical coordinates
 take advantage of the origin/xaxis/yaxis

