They have atleast one 90 degree angle.
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right triangle ( triangles with a right angle)
* Right triangle * square * rectangleA Right triangle, a parallelogram, a rectangle, a rhombus, a square and a diamond.
A square and a rectangle have 4 interior right angles also a right angle triangle has 1 right angle of 90 degrees
A triangle with 1 right angle is a right angle triangle.
a right triangle has one right angleA triangle with a right angle is a right triangle.