Can i have formula of calculating area

4 answers

of what ?
circle pi r^2
square s^2
rectangle L w

general
integral of dy dx ?
Area of Parallelogram
Google is a great help.

http://www.google.com/#q=Area+of+Parallelogram+
base times height. It is the same as a rectangle with a triangle taken off one end and tacked to the other end. Draw it.