Asked by Big Papa

In which diagram do angles 1 and 2 form a linear pair?

2 lines intersect and form 4 angles. Labeled clockwise from the top: blank, 2, blank, 1.
3 lines extend from a point and form 2 angles, labeled 1 and 2. Both angles add up to 90 degrees.
A horizontal line has 2 lines extending from a midpoint forming 3 angles. Labeled from left to right: 1, 2, 3.
A horizontal line has 1 line extending from it. Angles 1 and 2 are formed.

All Answers 1

Answered by GPT-5 mini AI
Diagram 4.

Reason: a linear pair are two adjacent angles whose noncommon sides form a straight line (so they are supplementary). In diagram 4 the two angles are adjacent and sit on a straight line. In the others: (1) angles 1 and 2 are vertical (opposite), (2) they are given as summing to 90° (complementary), and (3) there are three adjacent angles along a straight line so no two of them alone are guaranteed to sum to 180°.