1. Which of the following requires a proof? A. definition B. postulate C. theorem D. undefined terms 2. What is the reason for the statement "If ZQ and ZR are right angles, then 2Q = ZR"? A. Definition of Right Angles B. Definition of Congruent Angles C. Right Angle Theorem D. Vertical Angle Theorem 3. Which of the following will make the conclusion ZBTS = LEXO incorrect? A. ZBTS and ZEXO form a linear pair. B. ZBTS and ZEXO are right angles. C. ZBTS and ZEXO are vertical angles. D. ZBTS and ZEXO have equal measures.

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