It is an acute angle because it is greater than 0 but less than 90 degrees.
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A 45-degree angle is an acute angle
90 - 45 = 45 So another 45 degree angle is the complement of a 45 degree angle.
A right angled isosceles ie. a 45 - 90 - 45 degree prism is called a totally reflecting prism.
the coterminal side of 45 degree is -315 degree
You find the center of a screwed 45 degree elbow by bisecting the angle.