Question

are the triangles below acute, obtuse, or right?
triangle a
45°
45°
□
acute
obtuse
right
triangle b
50°
50°
80°
acute
obtuse
right
triangle c
120°
30°
30°
acute
obtuse
right
triangle d
75°
55°
50°
acute
obtuse
right

Explanation:

Step1: Analyze Triangle A

Has a right angle (90°), so right triangle.

Step2: Analyze Triangle B

All angles (50°,80°,50°) <90°, so acute.

Step3: Analyze Triangle C

Has 120°>90°, so obtuse.

Step4: Analyze Triangle D

All angles (75°,55°,50°) <90°, so acute.

Answer:

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