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7.Are the following pairs of lines parallel? Justify your answer:a.b.tc.95° B120°75°P.65°C 115°75° |
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Answer» a. no they are not parallel.115+95=180vertically opposite angle of 95=95.115 and 95 are co interior angles.if their sum=180.then the two lines are parallel.115+95=210 so they are not parallel. b.they are not parallel.65 and 120 are co interior angles.their sum is 185.So they are not parallel. c.they are parallel.vertically opposite angle of 75 is 75.the 75+x=180.x=105.therefore 75,105 are co interior angles.75+105=180.so they are parallel. |
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