It is an acute angle
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The 3rd angle will measure 180 -77 -62 = 41 degrees
C = 90 - 41 = 49 deg S = 180 - 41 = 139 deg
41
Since the sum of the internal angles of a plane triangle is 180 degrees, the measure of the missing angle is 65 degrees. 180 - 74 - 41 = 65 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.