A 45-degree angle is an acute angle
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There is none since an angle does not have a length.
It is reflected 90 degrees from its original direction.
The degree measure of five fourths of a right angle is 112.5 degrees
The third angle must be 90 degrees, so you have an "isosceles right triangle".
since it is a right triangle there is one 90 degree angle and another of the angles is 45 degrees. there is 180 degrees in a triangle so the missing angle is 45 degrees.