luveskyGuri luveskyGuri

24-11-2016
Mathematics

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B is the midpoint of AC. A has coordinates (-3, 4) and B has coordinates (-1 ½, 1). Find the coordinates of C.

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Nirina7 Nirina7

25-11-2016

A*C = B, so vecAB = vecBC, vecAB = (-1/2+3, -3) and vecBC(xc+1/2, yc-4)
it means -1/2+3 = xc+1/2, -3=yc-4, so C(2, -1)

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