THURSDAY, OCTOBER 20 IN THE FIGURE BELOW, POINT P IS ON LINE l. WHAT IS THE VALUE OF X? 1 CORRECT HOMEWORK: PERIOD 4: PRACTICE 2.6C PERIOD 5: PRACTICE 2.5B(#3) AND 2.5C 2 REVIEW PROPERTIES OF EQUALITY: REFLEXIVE: SYMMETRIC: TRANSITIVE: SUBSTITUTION: 3 DEFINITION OF CONGRUENCE: 4 SEGMENT ADDITION POSTULATE ANGLE ADDITION POSTULATE 5 LINEAR PAIR: COMPLEMENTARY ANGLES: SUPPLEMENTARY ANGLES: VERTICAL ANGLES: 6 NAME THE PROPERTY SHOWN. 1) 7 8 9 THEOREM 2.3 RIGHT ANGLE CONGRUENCE THEOREM ALL RIGHT ANGLES ARE CONGRUENT. GIVEN: 1 AND 2 ARE RIGHT ANGLES PROVE: 1 10 USING THE RIGHT ANGLE CONGRUENCE STATEMENT REASON 11 THEOREM 2.4 CONGRUENT SUPPLEMENTS THEOREM IF TWO ANGLES ARE SUPPLEMENTARY TO THE SAME ANGLE, THEN THEY ARE CONGRUENT. 2 1 3 IF 1 AND 2 ARE SUPPLEMENTARY AND 3 AND 2 ARE SUPPLEMENTARY THEN 1 3. 12 THEOREM 2.5 CONGRUENT COMPLEMENTS THEOREM OF TWO ANGLES ARE COMPLEMENTARY TO THE SAME ANGLE, THEN THEY ARE CONGRUENT. IF 4 AND 5 ARE COMPLEMENTARY AND 6 AND 5 ARE COMPLEMENTARY, THEN 4 6. 13 STATEMENT REASON 14 POSTULATE 12 LINEAR PAIR POSTULATE IF TWO ANGLES FORM A LINEAR PAIR, THEN THEY ARE SUPPLEMENTARY. 1 2 IF ANGLES 1 AND 2 FORM A LINEAR PAIR THEN THEY ARE SUPPLEMENTARY. 15 THEOREM 2.6 VERTICAL ANGLES CONGRUENCE THEOREM VERTICAL ANGLES ARE CONGRUENT 1 2 3 4 16 PAGES 127 # 8 11 4 1 2 3 17 12. (8X+7) (5Y) (7Y 34) (9X4) 18 13. 4X (7Y12) (6Y+8) (6X26) 19
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