It has a pair of perpendicular lines that meet at right angles to form the 90 degree angle of a right angle triangle.
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The Right Triangle. Perpendicular lines make a right angle.
right triangle
A right angle triangle has a pair of perpendicular lines that meet each other at 90 degrees.
That would be a right triangle. The perpendicular lines make up the right angle.
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.