Question

Prove using coordinate geometry: If a point is on the perpendicular bisector of a segment, then it is equidistant from the endpoints of the segment.
http://assets.openstudy.com/updates/attachments/5246df8ae4b034054f3dcd4c-mathgeek898-1380376524823-geometrymidterm.pdf
(Number 20)
Given: Line l is the perpendicular bisector of CD .
Prove: Point R(a, b) is equidistant from points C and D.

Answer 1

have u try it yet???

Answer 2

would use simple pythagoras theorem