C. Obtuse triangle has side lengths of 12,13,2 square root 3.
What is an obtuse triangle?
An obtuse triangle is a triangle in which one of the angles is an obtuse attitude, (glaringly, best an unmarried attitude in a triangle may be obtuse or it would not be a triangle.) A triangle needs to be either obtuse, acute, or proper.
An acute triangle is a triangle with 3 acute angles. An obtuse triangle is a triangle with one obtuse perspective and two acute angles. considering a triangle's angles need to sum to 180° in Euclidean geometry, no Euclidean triangle could have a couple of obtuse angle.
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