Hi,

I'm trying to determine the formula for a missing length of a known area irregular quadrilateral.

Its a fairly easy one, but i'm about 40 years outside of my math lessons!

It's a land area problem - and I know the area, but don't know the frontage. I know each side.

So the shape is a triangle on a square.

Example:

Left side = (LS) = 18M

Right side = (RS) = 14M

Area = 400 sq M

Unknown is the length of the square (B)?

I know the area of the triangle + area of the square = 400, which is:

400 = ([tex]\frac{1}{2}[/tex]* B * (LS-RS)) + (B * RS)

But I can't distill that down to an equation! I know the answer in this case is B=25, but I had to test numbers to find it. I'd like an equation for different values.

Many thanks!