Any triangle has three sides, whether it is a right triangle or not.
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In Euclidean geometry, 180. Other answers are possible, depending on the surface on which the triangle is drawn.
A right angle triangle has no parallel sides
There are no parallel sides in a right angle triangle
Perpendicular means meeting at a right angle. A right triangle has 2 sides that are perpendicular, so it has 1 pair of sides that are perpendicular They are known as the "legs" of the right triangle.
A scalene right triangle is a triangle that has no congruent sides and and one right angle.