The degree of the math triangle in senior one is 3 1 2 1', and the other is 52 degrees. How many degrees is it?
The sum of the internal angles of a triangle is equal to 180.
Two angles are known, and every three angles are:
180 -3 1 2 1′-52
= 128 -3 1 2 1′
= 127 60′-3 1 2 1′
=96 39′