Answer:
Triangles A and B are acute, C is right, and I think D might be obtuse.
Step-by-step explanation:
Acute means that the angles are less than 90 degrees, and obtuse means that at least one angle is more than 90 degrees.
Triangle A: Acute
Triangle B: Acute
Triangle C: Obtuse
Triangle D: Right
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. An obtuse triangle has one obtuse angle.
