Outer angles

The outer angle of the triangle ABC at the A vertex is 71°40 ' outer angle at the vertx B is 136°50'. What size has the inner triangle angle at the vertex C?

Correct result:

C =  28.5 °


A=180(71+40/60)=3253108.3333 B=180(136+50/60)=259643.1667 C=180(A+B)=180(108.3333+43.1667)=572=572=28.5=2830

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