In A ABC, if LA + LB => 42 and LB , LC =21 then LB = ?
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Answer:
answer in 53°
Step-by-step explanation:
LA-LB=42°-----------(1)
LB-LC=21-----------(2)
and we know that LA+LB+LC=180°
3LB=180-42+21=159
LB=53°
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