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A protractor can be used to measure an angle. An angle is basically part of a circle. A complete circle is 360 degrees. A right-angle is 90 degrees, half a circle is 180 degrees, and so on.
The measure of a right angle is 90 degrees .
One half of a right angle is a 45 degree angle.
90 degrees is the measure of a right angle
It is 1.5 times 90 = 135 degrees