Practice problem
The two circles above have the same radius. What can we say about CD‾\overline{CD}CD?
It looks like the angle bisector of ∠ACB\angle ACB∠ACB but it cannot be proven.
It is not the angle bisector of ∠ACB\angle ACB∠ACB.
It is the angle bisector of ∠ACB\angle ACB∠ACB, this can be proven.
Type a concept, like “slope” or “photosynthesis”.
