Three like any other triangle has.
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A triangle has 3 sides (or edges) and 3 corners (or angles)
An obtuse triangle can have no right angles, and has two equal angles.
An equilateral triangle has sides and angles. There are 3 sides in any triangle. Edges are in three dimensional figures.
A right triangle can have 2 equal angles if they are each 45° (any other right triangle will have no equal angles)
No right triangle can have any obtuse angles inside it.