Multiple-Choice:Given that a triangle with vertices A(2,1),B(4,5),and C(6,1) is reflected across
问题描述：
Multiple-Choice:Given that a triangle with vertices A(2,1),B(4,5),and C(6,1) is reflected across
the y-axis,what will be the coordinates of the image of
(a) (-5,4) (b) (-4,5) (c) (4,-5) (d) (5,-4)
答
The answer is (b)
已知一个三角形的三个顶点坐标,求对称于Y轴三角形B点镜像点的坐标.