There are three angles, three sides, and three corners. Tri means three.
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There are 3 angles in a triangle.
An obtuse triangle can have no right angles, and has two equal angles.
A triangle has 3 angles.
In an isosceles triangle, two of the angles are the same.
A right triangle can have 2 equal angles if they are each 45° (any other right triangle will have no equal angles)