0301 MC PQ and RS are two lines that intersect at point T as

(03.01 MC) PQ and RS are two lines that intersect at point T, as shown below: Which fact is used to prove that angle PTR is always equal to angle STQ? If two angles are equal to the same measure, then the angles are congruent. If two angles are equal to the same measure, then the angles are supplementary. Lines PQ and RS have a fixed length. Lines PQ and RS intersect at right angles.

Solution

Only suitable choice is first one

Angles are congruent if they have same measure.

All others can be wrong at some cases.