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if equals are added to equals their sums are equal
if equals are subtracted from equals their differences are equal
if equals are multiplied to equals their products are equal
if equals are divided by nonzero equals their quotients are equal
(reflective law) a quantity is = to itself.
(symmetric law) is a=b then b=a, if a+b=y then y=a+b
(transitivity law) is a=b, and b=c, then a=c
a=y and a=x then x=y, if a=x, b=y, and a=b then x=y, if a=b, and a+x=y, then b+x=y
once around a circle is 360 degrees
only one line can be between 2 points
2 lines can only intersect once
a line segment is the shortest distance between 2 point on a plane
any geometric shape can be moved without it changing its form
a line segment can only have 1 mid point
an angle can only have 1 bisector
the perpendicular is the shortest line segment between a point and a line
the sum (of the measures) of the angles on one side of the line is 180 degrees
2 adjacent angles are supplementary IF their exterior sides are in a straight line
Every line consists of infinitely many points (is a set of infinitely many points).
Through any two distinct points there is exactly one line.