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Dear stuent Please post one question at a time ABCD is parallelogram Draw traingle AA1C AA1 + A1C = AC A1 is mipoint of BC A1C = 0.5 BC AA1+ 0.5BC = ACAA1 = AC -0.5BC ...........(1)Draw traingle AB1C AB1 + B1C = AC B1C = 0.5DC AB1 = AC - 0.5DC...........(2)adding 1 and 2 AA1 +AB1 = 2AC -0.5(BC +AB)But we know from traingular law of addition AB + BC = AC AA1 + AB1 = 2AC - 0.5AC AA1 + AB1 = 1.5 AC S0, lmbda = 1.5
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