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_ABC AABC ABCD addition Algebra Algebra of Sets altitude angles are congruent associative property Assumption base 10 numerals Cartesian product closed curve commutative property consider contains convex polygon convex set coordinate counting numbers decimal defined digit distinct points Draw empty set endpoints equality of real Euler diagrams example Exercises exists exterior angle F F F F T F factor false geometry given half-plane identity element indicated integers interior intersection irrational numbers length line segment m(/_ABC m(AB m(AC m(BC m(BD m(CD mathematics midpoint multiplication of rational negation nested intervals number line parallel parallelogram plane polygonal region positive integer postulate prime numbers proof of Theorem property of equality Prove quotient rational numbers real numbers represent right angle right triangle set of points sides student subset subtraction symbol true truth table Venn diagrams vertices whole numbers zero