An angle of 90 degrees is known as a right angle. If the endpoint of a ray is placed on a line and is perpendicular to that line, two right angles will be formed on either side of the ray.
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if you add them they will equal 90degrees.
Your question contains the answer. It is a 'right' triangle.
A trapezoid can have these specifications. 90 degrees by 90 degrees by n degrees<90degrees by n degrees>90degrees. The total of the trapezoid's angles must be 360 degrees.
It is: "angle a is not a right angle" or "angle a is greater than or less than a right angle".
angle B and angle D are supplements, angle B is congruent to angle D, angle A is congruent to angle A, or angle A is congruent to angle C