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A right angle is an angle that is equal to 90 degrees. It looks more like an L-shaped angle.
Contains one right angle, and the sum of the remaining angles is 90 degrees. Has 2 legs and 1 hypotenuse.
A triangle with one right angle and two equal sides is called an isosceles right angled triangle.
This question needs more information. It probably has a diagram, which is hard to describe in words. Please resubmit your question if you can do that.
A "benchmark angle" is a simple one like 45, 90, 180 degrees. I think this question is about a diagram which I don't see. As a matter of fact, the Answers.com browser makes it impossible to draw diagrams . . . the best we can do is to describe the diagram in words. e.g. "In isosceles triangle ABC, A is the vertex and D is the midpoint of BC. If angle B is 50 degrees, what is the measure of angle BAD?