γ=180°-α-β
180 -3/5 γ-1/3 *3/5 γ=γ
γ+3/5 γ+1/3*3/5 γ=180
γ+ 9/15 γ+ 3/15 γ =180
27/15 γ =180
γ= 100
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γ=180°-α-β
180 -3/5 γ-1/3 *3/5 γ=γ
γ+3/5 γ+1/3*3/5 γ=180
γ+ 9/15 γ+ 3/15 γ =180
27/15 γ =180
γ= 100