Answer:
Triangle A: Acute
Triangle B: Obtuse
Triangle C: Acute
Triangle D: Right
Step-by-step explanation:
Acute angle: 0°-90°
Right angle: 90°
Obtuse angle: 90°-180°
An acute triangle only has acute angles. A right triangle has one right angle and two acute angles. An obtuse triangle has one obtuse angle and two acute angles.
