Question

已知△ABC的顶点A的坐标为(2,-3),B的坐标为(-3,4),△ABC的重点的坐标为(-1,-5),则顶点C的坐标为

Answer 1

重心坐标((xA+xB+xC)/3,(yA+yB+yC)/3)

(2-3+xC)/3=-1 -1+xC=-3 xC=-2

(-3+4+yC)/3=-5 1+yC=-15 yC=-16

顶点C的坐标为(-2,-16)