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A supplementary angle is the one you would add to an angle to bring the total to 180°, In this that would be 15°.
Supplementary angles add up to 180 degrees so it is 152 degrees and 15 minutes
No. An obtuse angle has a measure of between 90 and 180 degrees.
Exterior angle: 24 degrees Interior angle: 156 degrees
The sum of an angle and its complement is 90 degrees. So the unknown angle must be 90 - 75 = 15 degrees.