Two sides and they meet each other at 90 degrees.
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2, the two smallest sides are perpendicular to eachother.
The 2 perpendicular sides of a right angle triangle intersect each other at right angles
A right angle has one pair of perpendicular sides.
If it's a right triangle, then one.There is no other way to have a perpendicular angle in a triangle without it being 90 degrees, or right.
Unless it is a right isosceles triangle, a normal right triangle has no pairs of equal sides.