45 degree - if the question concerns an angle. If it is temperature, the answer depends on the scale.
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Very similar to to a 45 degree angle, but a bit smaller. Imagine half of a right angle which is 90 degrees.
A right angle is 90 degrees, so 45 degrees is half a right angle turn.
45 is half of 90.
A 90 degree angle
It is: 73+17 = 90 degrees