Question

classify the following triangle as acute, obtuse, or right.

a. acute
b. obtuse
c. right
d. none of these

Explanation:

Step1: Recall angle - type definitions

An acute - angled triangle has all angles less than 90°. An obtuse - angled triangle has one angle greater than 90°. A right - angled triangle has one angle equal to 90°.

Step2: Identify triangle's angles

The given triangle has one angle equal to 90° and two angles equal to 45°.

Answer:

C. Right