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Deductive Reasoning is a process of reasoning logically from given facts to a conclusion.
Addition Property of equality if a=b then a+c=b+c
Subtraction Property of equality if a=b then a-c=b-c
Multiplication Property of equalityif a = b then ac = bc
Division Property of equality if a=b then a/c = b/c c≠0
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Substitution Property– if a=b, then b can replace a in any expression
Distributive Property – a(b+c) = ab + ac
Reflexive Property AB = AB Symmetric Property if AB = CD then CD
= AB Transitive Property if AB = CD & CD =
EF then AB = EF
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Draw two intersecting lines. Fold the sides of <1 onto <2. What do
you notice? Fold the sides of <3 onto <4. what do
you notice? Make a conjecture about the angles
formed by two intersecting lines.
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Vertical angles – two whose sides are opposite rays.
Adjacent angles – two coplanar angles with a common vertex, no common interior points.
Complementary angles – two angles , the sum of whose measure is 90.
Supplementary angles – two angles, the sum of whose measures is 180.
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Vertical Angles Theorem – Vertical angles are congruent.
Congruent Supplements Theorem – If two angles are supplements of congruent angles (or of the same angle), then the two angles are congruent.
Congruent Complements Theorem – If two angles are complements of congruent angles (or of the same angle, then the two angles are congruent.