It is an acute angle because it is greater than 0 but less than 90 degrees
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77 degrees
The 3rd angle will measure 180 -77 -62 = 41 degrees
The complement of an acute angle A is the angle 90° - A. The complement of 13° is 77°.
What ever it needs to make 180. 39+77=116 You still needs64 degrees.
When an angle has a measure of 120 degrees, it is an obtuse angle. When an angle is an obtuse angle its measure is between 90 and 180 degrees. That is: 90 degrees < obtuse angle < 180 degrees.