For getting help, there are various venues. Which of these have you tried so far and how were they inadequate to your unstated needs exactly?

• perldoc Math::Geometry::Planar gives you help on the module if it's installed locally.
• Search.cpan.org knows about the module, obviously
• Google knows about the module

Also note that while the answer may be urgent for you, it is not for us. Please use proper spelling ("please" instead of plz) and using a proper, descriptive title, like "Searching for the documentation of Math::Geometry::Planar" would be even better.