60 degrees
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90 take away 73...
It is 19 degrees. You can find the compliment of an angle by subtracting that angle from 90.
To find the degree of angle of a side of a triangle, a protractor is needed to measure the angle. Place the '0' on the protractor on the point of the angle and look at the top part to determine degree of angle. To measure the length of a triangle side, a simple ruler can be used to measure the length.
135 degree
Usually by means of a protractor.