Question 208490
B=C
A=B+141 OR A-B=141
A+B+C=180
A+2B=180
-(A-B=141) SUBTRACT THESE TWO EQUATIONS
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2B+B=39
3B=39
B=39/3
B=13 DEGREES. C=13 DEGREES.
A=13+141
A=154 DEGREES.
PROOF:
154+13+13=180
180=180