Question 732036
A=B-12
C=A+B
A+B+C=180
(B-12)+B+(B-12+B)=180
4B=180+12+12
4B=204
B=204/4
B=51 DEGREES FOR THE MIDDLE ANGLE.
A=51-12=39 DEGREES FOPR THE SMALLER ANGLE.
C=51+39=90 DEGREES FOR THE LARGER ANGLE.
PROOF:
39+51+90=180
180=180