Two sides, A and B meet always at a right angle, that is 90 degrees.
The third side, C, called the hypotenuse, meet A and B so that their angles made with A and B adds up to 90 degrees ( total of 3 inside angles = 180 ).
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There can be no such triangle.
A triangle has no parallel sides but in the form of a right angle triangle it has perpendicular lines that meet at right angles which is 90 degrees.
A right angle triangle has no parallel sides
It can be because it depends on the triangle's angles. For example, if the triangle has 2 equal sides and a right angle it could be a isosceles and a right triangle.
Every triangle have 6 main parts: 3 sides and 3 angles. On a right triangle one of the angles has to be a right angle, meaning it has a 90 degree angle.