An acute angle would be 13 degrees. This is because the angle measurement does not exceed 90. Anything below 90 degrees is "acute" while anything above 90 is "obtuse".
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The complement of an acute angle A is the angle 90° - A. The complement of 13° is 77°.
77 degrees
It is: 180-167 = 13 degrees
The dimensions given fits that of a right angle triangle and sin^-1(12/13) = 67.38 degrees
Each exterior angle is 360/13 = 27.7 degrees rounded to 1 decimal place