## Online Course Discussion Forum

### MCIII Geo Help 2.15 and 2.16

I'm stuck on 2.15 and 2.16. For 2.15, I did some translations and boundary cases but I got nowhere. For 2.16, I tried some rotations and also went nowhere.

Review Example 2 under "Reflection". For 2.15, to minimize sum of the segments, you want to reflect them so that the straight line can be drawn.

For 2.16, reflect the point $P$ across the center $O$ to point $P'$, then $CP^2+DP^2 = CP^2+CP'^2$. Then find out about the relation among $CP$, $CP'$, $OC$, and $OP$.

Social networks