How do I find the area of a figure with different measurments?
Squares and Rectangles: Area is equal to length multiplied by width.
$\displaystyle A = lw$
Circles: Area is equal to pi multiplied by the square of the radius.
$\displaystyle A = \pi r^2$
Triangles: Area is equal to one half of the base multiplied by the height.
$\displaystyle A = \frac{1}{2}bh$
I'm not exactly sure what you are asking, so if that doesn't answer your question then be more specific.
You should be aware that just knowing the lengths of the sides is NOT generally sufficient to tell you the area of a figure. You also need to know at least some of the angles. For example, there exist an infinite number of parallelograms with sides of length "3" and "4" but with different angles and different areas.