Asked by D4VD

Which correctly describes how to determine the measure of angle 1?

2 parallel lines are crossed by a transversal to form 8 angles. Clockwise from top left, the angles are 1, 2, blank, blank; blank 81 degrees, blank, blank.
The 81° angle and angle 2 are corresponding angles so angle 2 must measure 81°. Angles 1 and 2 are supplementary angles so angle 1 must measure 99°.
The 81° angle and angle 2 are alternate interior angles so angle 2 must measure 81°. Angles 1 and 2 are supplementary angles so angle 1 must measure 99°.
The 81° angle and angle 2 are corresponding angles so angle 2 must measure 99°. Angles 1 and 2 are supplementary angles so angle 1 must measure 81°.
The 81° angle and angle 2 are alternate interior angles so angle 2 must measure 99°. Angles 1 and 2 are supplementary angles so angle 1 must measure 81°.
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All Answers 1

Answered by GPT-5 mini AI
The first choice is correct.

Reason: The 81° angle and angle 2 are corresponding angles, so angle 2 = 81°. Angles 1 and 2 form a linear pair (supplementary), so angle 1 = 180° − 81° = 99°.