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### 10 Cards in this Set

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 Midpoint Thm If M is the midpoint of segment AB, then 2AM=AB and AM=1/2AB 2MB=AB and MB=1/2AB Angle bisector thm If ray BX is the bisector of ∠ABC, then 2m∠ABX=m∠ABC; m∠ABX=1/2m∠ABC 2m∠XBC=m∠ABC; m∠XBC=1/2m∠ABC Vertical Angle thm vertical ∠'s are congruent Vertical Angle thm conjecture If angles are vertical, then they are congruent. If two lines are perpendicular, then adjacent ∠'s are congruent. If two lines form congruent adjacent ∠'s, then the lines are perpendicular If the exterior sides of two adjacent acute ∠'s are perpendicular, then the ∠'s are complementary. Congruent Supplement thm If 2 ∠'s are supplements of congruent ∠'s (or the same ∠), then the 2 ∠'s are congruent. Congruent complement thm If 2 ∠'s are complements of congruent ∠'s (or the same ∠), then the 2 ∠'s are congruent. If 2 parallel planes are cut by a third plane, then the lines of intersection are ||.