Question

which angle number represents the linear pair of ∠txs?

Explanation:

Step1: Identify ∠TXS

∠TXS has vertex X, sides XT and XS.

Step2: Locate linear pair

Linear pair: adjacent, sum to 180°, common vertex X, shared side XT, other side XR (opposite XS on straight line RS). This angle is labeled 3.

Answer:

3