contruct a pentagon with circle and linial only

Hi schipper,

Good day and thanks for your question.

I have found two websites which explain how you can construct the
pentagon.

http://mathcentral.uregina.ca/qq/database/QQ.09.02/mary1.html

http://www.cut-the-knot.org/pythagoras/pentagon.shtml

If you have any clarifications, please don't hesitate to ask and I
will gladfully clear them for you.

Thank you for using this service and have a nice day.

Regards,
aditya2k