Mathematics
An obtuse-angled triangle can be
right-angled
isosceles
equilateral
none of these
Triangles
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Answer
An obtuse-angled triangle has one obtuse angle (greater than 90°).
It cannot be right-angled (already has obtuse angle, sum would exceed 180°).
It cannot be equilateral (equilateral has all 60° angles, all acute).
It can be isosceles (e.g., 100°, 40°, 40° — two equal angles, two equal sides).
Hence, option 2 is the correct option.
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