Question

1. what kind of triangle is this?

a) obtuse
b) acute
c) right

Explanation:

Step1: Recall triangle types

An obtuse triangle has one angle > 90°, right has one 90°, acute has all < 90°.

Step2: Check given angles

Angles: 39°, 50°, 91°. 91° > 90°, so one obtuse angle.

Answer:

a) obtuse