Ex2a: Reflection in the line y = 0
What stays the same and what changes as you move the points around?
Are there any points that do not move under this transformation?
Where would the co-ordinate (x,y) map to?
随着点的移动,什么保持不变,什么改变?
在此转换过程中,有没有要解决的问题?
坐标(x,y)会映射到哪里?
Created by N.Trubridge