Question

are the triangles below acute, obtuse, or right? triangle a triangle b triangle c triangle d

Explanation:

Step1: Recall angle - type definitions

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

Step2: Analyze Triangle A

Triangle A has angles 30°, 30°, and 120°. Since 120°>90°, it is an obtuse triangle.

Step3: Analyze Triangle B

Triangle B has a 90° angle (the right - angle symbol). So it is a right triangle.

Step4: Analyze Triangle C

Triangle C has angles 30°, 35°, and 115°. Since 115°>90°, it is an obtuse triangle.

Step5: Analyze Triangle D

Triangle D has angles 80°, 50°, and 50°. All angles are less than 90°, so it is an acute triangle.

Answer:

Triangle A: Obtuse
Triangle B: Right
Triangle C: Obtuse
Triangle D: Acute