question_answer

Find the measurement of A if B and C are given when A, B and C are the angles of the triangle.  

A) \[A=180{}^\circ -(B+C)\]

B) \[A={{180}^{{}^\circ }}+(B-C)\]

C) \[A=180{}^\circ +C-B\]           

D) \[A=180{}^\circ +C+B\]

E) None of these