Question

5.if a right triangle abc is rotated 180° clockwise. what is the angle measure of angle abc?

Explanation:

Step1: Recall rotation property

Rotation is a rigid - motion. Rigid - motions preserve angle measures.

Step2: Identify original angle measure

In right - triangle ABC, assume angle ABC is a right angle, so $\angle ABC = 90^{\circ}$.

Step3: Determine new angle measure

When triangle ABC is rotated 180° clockwise to form triangle A'B'C', the angle measure is preserved. So $\angle A'B'C'=\angle ABC$.

Answer:

$90^{\circ}$