Geometry

Question Analysis:
This question involves classifying triangles based on angle measures.
The main focus is differentiating acute, right, and obtuse triangles.

Key Concept Explanation:
Acute Triangle: All three angles are less than 90°.
Right Triangle: One angle is exactly 90°.
Obtuse Triangle: One angle is greater than 90°.

Step-by-Step Solution:
(A) Acute Triangle: ✅ Correct, because it classifies triangles based on angles.
(B) Right Triangle: ✅ Correct, because it classifies triangles based on angles.
(C) Obtuse Triangle: ✅ Correct, because it classifies triangles based on angles.
(D) Isosceles Triangle: ❌ Incorrect, because "isosceles" refers to sides, not angles.

Common Mistakes:
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