Hint: 90/2=...
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90 - 45 = 45 So another 45 degree angle is the complement of a 45 degree angle.
45
Since 45 degrees is half of 90, you can use two 45s to make a 90.
A 45 degree elbow will not make a right angle, but two will, if connected in line so that they continue the turn in the same direction. (45o + 45o = 90o, a right angle.)
it will become 45 degree