- Aright-angled
- Bacute-angled
- Cobtuse-angled
- Dequilateral
Step-by-Step Solution
Adjacent interior angle = 180 - 90 = 90°, so one interior angle of the triangle is 90°, making it right-angled.
Answer: A) right-angled
If an exterior angle of a triangle equals 90°, the triangle is:
Class 7Exterior Angle PropertyTriangles
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