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Assuming your question is what makes a right-angle, it is an angle of 90o .
A right triangle is one that has a right angle.
Right triangles have two acute angles, but that doesn't make them right. Having a right angle makes them right.
Three right angles, where one of the "arms" of the angle curves inwards which makes the angle appear less than a right angle.
It could be a right trapezium, a kite (diamond), or just a general quadrilateral which meets these requirements.It could be a right trapezium, a kite (diamond), or just a general quadrilateral which meets these requirements.It could be a right trapezium, a kite (diamond), or just a general quadrilateral which meets these requirements.It could be a right trapezium, a kite (diamond), or just a general quadrilateral which meets these requirements.