Google Classroom
GeoGebraGeoGebra Classroom

Reflections Warmup

Use the applet below to reflect triangle ABC across line DE.


Now, connect each original point to its image. How do the segments connecting A to A', B to B', and C to C' look like they relate to line DE?

What do you notice about how far away A and A' (the image of point A, after the reflection) are from line DE?