Question 274988
go here:
http://www.geom.uiuc.edu/docs/reference/CRC-formulas/node1.html
this site will give u all the formulas for geometry

or if u have a geometry book look for the formulas pertaining to your section for example slope: {{{m=((y-y)/(x-x))}}}  and y-intercept: {{{y=mx+b}}}
there are alot of formulas u must memorize including {{{A^2+B^2=C^2}}} for triangles and {{{P=2l+2w}}} for perimeter. 

good luck in ur studies