Imagine a clock: a circle is 360 degrees, so every 5 minutes is 30 degrees. If you started at 1pm and rotated it 90 degrees it would be 1.15pm
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if you add them they will equal 90degrees.
Your question contains the answer. It is a 'right' triangle.
right angle
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.
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.