Discussion
A triangle having all sides of different lengths is called :
Answer: A
A triangle with all sides of different lengths is a scalene triangle.
Triangles are classified by their sides as scalene (no two sides equal, so all three angles are different too), isosceles (at least two sides equal, with the angles opposite them equal) and equilateral (all three sides equal, each angle 60°).
A right triangle is a classification by angle, one angle being 90°; it can itself be scalene or isosceles, so it is not the name for 'all sides different'. Equilateral and isosceles triangles both have equal sides, which contradicts the description.
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