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Yuki888 [10]
3 years ago
9

M∠9 = 6x and m∠11 = 120, find the value x so that line c is parallel to line d

Mathematics
1 answer:
ASHA 777 [7]3 years ago
5 0
If line c is parallel to line d, the measure of angle 9 should be the same as angle 11 according to the Corresponding angles postulate. I<span>f a transversal (line b in this case) intersects two lines (lines c and d) and the corresponding angles are congruent, then the lines are parallel.

So now since the m</span>∠11 is 120 and m∠11 is congruent to m∠9 then we can solve for x. 

m∠9 = 6x
m∠11 = 120
<span>
6x = 120

Divide both sides by 6 to get x. 

6x/6 = 120/6
x = 20

The answer is then A. </span>
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