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Condition for Two Lines to Be Parallel

If the two li...

Question

If the two lines $l_{1}$ and $l_{2}$ are parallel, find the value of angle x in degrees.

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Solution

Since the two lines  $l_{1}$ and $l_{2}$ are parallel.
Thus, alternate exterior angles are equal.
Therefore, $x$ =  $80^{o}$

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