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Post.+Theorems def.

Stack #27178

def. of congruence angles or segments with the same measure
def. of perpendicular when 2 angles intersect in such a way that a right angle is formed
definition of supplementary 2 angles whose sum is 180 degrees
def. of complementary 2 angles whose sum is 90 degrees
def. of segment bisector any segment, line, or plane, that intersects of its midpoint
def. of angle bisector angles are cut in half by another line
reflexive a=a
symmetric if a=b then b=a
transitive if a=b, b=c, then a=c
addition property of = if a=b, c=d then a+b=c+d