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I need help on this question it’s urgent please help-example-1
User Matt Howell
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1 Answer

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To answer this question, we define the angles a, b and c from the picture below:

From the picture we see the following:

1) The lines t and l_1 are perpendicular because the angle between them is equal to 90°.

2) The angles 120° and b are supplementary, so they sum up 180°. Taking to account this, we have:


\begin{gathered} 120^(\circ)+b=180^(\circ), \\ b=180^(\circ)-120^(\circ)=60^(\circ)\text{.} \end{gathered}

3) The angles c and 60° are supplementary, so they sum up 180°. Taking to account this, we have:


\begin{gathered} c+60^(\circ)=180^(\circ), \\ b=180^(\circ)-60^(\circ)=120^(\circ)\text{.} \end{gathered}

From points 2 and 3 we conclude that lines l_2 and l_3 are parallel.

Answer

a.


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I need help on this question it’s urgent please help-example-1
User Karlkeller
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