A 45 degree angle is half of a right angle (90 degrees)
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An oblique angle is any angle not 90 degrees or a multiple of 90 degrees. So 45 degrees is an oblique angle. A 45 degree angle is also an acute angle (anything less than 90 degrees).
90 - 45 = 45 So another 45 degree angle is the complement of a 45 degree angle.
Since 45 degrees is half of 90, you can use two 45s to make a 90.
45 45 and 90
Hint: 90/2=...