Chapter 19 #1
Level
pending
what makes DF=EF?
Apollonius’ theorem
Pythagoras theorem
Angle bisector theorem
This section requires Javascript.
You are seeing this because something didn't load right. We suggest you, (a) try
refreshing the page, (b) enabling javascript if it is disabled on your browser and,
finally, (c)
loading the
non-javascript version of this page
. We're sorry about the hassle.
1 solution
angle bisector theorem--> 角平分线线上的点到角两边的距离相等