You use the points of the vertex and on the two sides. For example a right angle with a vertex of A and two sides B and C. would be Angle BAC
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A 90o angle is a right angle, and a triangle with a right angle is called a right triangle.
90o angle
A right angle
So basically , you have an right angle and another angle . You draw an right angle over the angle your looking at and if its smaller than the right angle then its an acute angle . If its bigger than the right angle then its a obtuse angle . GoodLuck!(;
A parallelogram with one right angle has four of them. The name for this figure is a rectangle.