- A90°
- B180°
- C45°
- D0°
Step-by-Step Solution
Exterior angle at B = 180 - interior angle B = 180 - 90 = 90 deg (linear pair). It also equals angle A + angle C = 90 since A + C = 90 in a right triangle.
Answer: A) 90°
In triangle ABC, angle B = 90°. Side AB is extended beyond B. Reasoning: explain what the exterior angle at B equals, and give its measure.
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