Question

what kind of triangle is this? equilateral isosceles but not equilateral scalene

Explanation:

Step1: Recall triangle - type definitions

An equilateral triangle has all angles equal to 60°. An isosceles triangle has two equal angles. A scalene triangle has all angles different.

Step2: Analyze given angles

The given angles are 91°, 51°, and 38°. All three angles are different.

Answer:

scalene