Pre-Calculus Homework Solutions 159

# Pre-Calculus Homework Solutions 159 - 68. You could use the...

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68. You could use the slope formula to find that B w C w ± B w ± w C w ± w .Thus, / ABC > / A ± B ± C ± and / ACB > / A ± C ± B ± because of corresponding angles. / A > / A ± because of the Third Angle Theorem. 69. The sides are proportional and the angles are congruent, so the triangles are similar. Page 297 Maintain Your Skills 70. } 7 b .8 } 5 ¬ } 2 3 } 3 b 5 ¬ 7.8(2) 3 b 5 ¬ 15.6 b 5 ¬ 5.2 71. } c c 2 1 2 3 } 5 ¬ } 5 4 } ( c 2 2)(4) 5 ¬ ( c 1 3)(5) 4 c 2 8 5 ¬ 5 c 1 15 2 c 2 8 5 ¬ 15 2 c 5 ¬ 23 c 5 ¬ 2 23 72. } 4 y 2 1 5 } 5 ¬ } 2 y 4 } 2 y 5 ¬ (4 y 1 5)( 2 4) 2 y 5 ¬ 2 16 y 2 20 18 y 5 ¬ 2 20 y 5 ¬ 2 } 1 9 0 } 73. B w C w > B w A w , B w O w > B w O w , and m / OBC . m / OBA .By the SAS Inequality, OC . AO . 74. n ABC is isosceles with base angles } 1 2 } [180 2 (68 1 40)] 5 36. Then m / AOB 5 180 2 (40 1 36) 5 104 and m / AOD 5 180 2 104 5 76 so, m / AOD , m / AOB . 75. m / ABD . m / ADB because if one side of a triangle is longer than another side, then the angle opposite the longer side has a greater
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## This note was uploaded on 12/19/2011 for the course MAC 1140 taught by Professor Dr.zhan during the Fall '10 term at UNF.

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