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ANSWERS TO HOMEWORK

ANSWERS TO HOMEWORK. Front 1 & 6) corr.angles 2) If perp. to 1 line, then perp. to the other line 3 & 8) SSI angles are supps 4& 7) Alt. Int. angles 5) Vert. angles cong. 9) 6,9,14,3,8,11,16 10) 2,4,5,7,10,12,13,15 11) #9 angles =120 #10 angles = 60

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ANSWERS TO HOMEWORK

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  1. ANSWERS TO HOMEWORK Front 1 & 6) corr.angles 2) If perp. to 1 line, then perp. to the other line 3 & 8) SSI angles are supps 4& 7) Alt. Int. angles 5) Vert. angles cong. 9) 6,9,14,3,8,11,16 10) 2,4,5,7,10,12,13,15 11) #9 angles =120 #10 angles = 60 12) 80, 100 13) 75, 75 14) 85, 85 15) 85, 95 18) Given, Corr. Angles are congruent, Subst. 19) Def. of Perp., If perp. to 1 line, perp. to other, Def of perp., subst.

  2. Answers to Back 1) x = 18, y = 20 2) x = 15, y = 18 3) x = 15, y = 40 4) x and y = 70 5) x= 60 y = 65 6) x = 50 y = 90 7) x = 42 y = 108 z = 18 8) x = 110 y = 24 z = 34 9) x = 20 y = 25 z = 24 10) x = 50 y = 10 z = 65 11) Given, Alt. Int angles are congruent, Ang. Add. Post., Subst.

  3. 3-3 Proving Lines Parallel

  4. CONVERSE DAY!!! Use these to Prove Lines are parallel. They will ask you “Are the lines Parallel?” Postulate If two lines are cut by a transversal and corr. angles are cong. then the lines are parallel. Theorem If two lines are cut by a transversal and alt. int. angles are congruent, then the lines are parallel

  5. CONVERSE DAY!!! Theorem If 2 lines are cut by a transversal and SSI are supplements, then the lines are parallel. Theorem Two lines perpendicular to the same line are parallel.

  6. TOO • Page 86 #5-11 Answers: • PL || AR • PA || LR • No parallel lines • PL || AR • No parallel lines • PL || AR • PA || LR

  7. Homework • Page 87 #1-21, 24, 25 • 24 is a 4 step proof • 25 is a 3 step proof

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