we can say that if one of the eight angles if a parallel line is 90°, then all other angles are also 90°.
We have the information that:
Line r cuts a pair of parallel lines. One of the eight angles created measures 90°.
Now, we can say that the alternate interior angles hat will be formed by the line or transversal will also be 90°.
Now, For co- interior angles, we get that:
Let them be x
x + 90° = 180°
x = 90°
So, we get that all the other angles will also be 90°.
Therefore we can say that if one of the eight angles if a parallel line is 90°, then all other angles are also 90°.
Learn more about parallel lines here:
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