Q 5.In a A ABC, LA +B=110' and C+ZA=135º. Find all 3 angles.
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Answer:
B=110-A _1
C=135-A _2
A+B+C=180
A+110-A+C=180 SUB_1
110+C=180
110+135-A=180 SUB_2
-A=180-235
A=235-180
A=55
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