No.
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Only in right angle triangles
Any that do not have one angle that is exactly 90 degrees
a TRIANGLE THAT HAS A 90 DEGREE ANGLE A right triangle is a triangle that has exactly 90 degrees for one angle.
A trapezoid can have two right angles, one obtuse angle and one acute angle that altogether add up to 360 degrees.
An angle which measures exactly 90 degrees is called a "right" angle. (One measuring less than 90 is 'acute', and one measuring more than 90 degrees is 'obtuse'.)