Classify triangles
Classify a triangle by its side lengths (scalene, isosceles, equilateral) or by its angle measures (acute, right, obtuse). Unlimited questions, five difficulty levels, and a full worked solution every time, included free with weekly lessons.
Try one
A triangle has angles measuring 90 deg, 55 deg, 35 deg. How would you classify it by its angles?
- cannot be determined
- right
- acute
- obtuse
Answer: right
See one solved, step by step
A triangle has angles measuring 9 deg, 145 deg, 26 deg. How would you classify it by its angles?
- right
- cannot be determined
- acute
- obtuse
📘 Worked solution
19 + 145 + 26 = 180The three angles of any triangle always add up to 180 degrees.
2Classification: obtuseOne angle is more than 90 deg, so it's an obtuse triangle.
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