Find Measure in Degrees and Minutes of Third Angle in a Triangle

A diagram of a triangle is given with angle A measuring 30 degrees 52 minutes and angle B measuring 92 degrees 45 minutes. As the sum of the angles in a triangle is 180 degrees, the measures of angles A and B are added together and this value is then subtracted from 180 degrees. The addition and subtraction are carried out in a vertical format and it is important to remember that one degree is equal to 60 minutes. The sum of angles A and B is 122 degrees 97 minutes, so this has to be rewritten as the number of minutes is greater than 60. Also in order for the subtraction to be carried out, 1 degree is "borrowed" from180 degrees and converted into 60 minutes, so it is rewritten as 179 degrees 60 minutes.

Timestamps
0:00 Introduction
0:25 Sum of Angles=180 Degrees
1:02 Angle A + Angle B
2:54 Find Angle C