If l||m and the measure of angle 7 is twice the measure of angle 2, then the measure of angle 7 is?  

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I assume that we have two lines, l and m, that are parallel. The lines are cut by a transversal t creating 8 numbered angles. Since angle 2 and angle 7 are not congruent, they must be supplementary.

Then `m/_2+m/_7=180`

But we know `m/_7=2m/_2` Substituting we get:

`m/_2+2m/_2=180`

`3m/_2=180`

`m/_2=60`

`==>m/_7=120`

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The measure of angle 7 is 120 degrees.

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