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I need to calculate the Area of dirt under a house to remove/add to level an area to install a water bladder?

Think of under a house. You have rows of Stumps. We need to level an area between the stumps to put in an under-house water bladder.
I know the width and length of the space and I can calculate the distance from the floor (which will be my level reference – normally we assume the base of an area if what is flat.)
Width = 1.2m
Length = 5m
Now we have at our 4 corners..
1.Near left – 1.2m from floor
2.Near Right – 1.8m from floor (indicating a fall of .6m over the width of the space)
3.Far left – .6m from floor (indicating a rise of .6m over length on that side)
4.Far right – 2.1m from floor (indicating a fall of .3m front to back on that side and fall of 1.5m left to right at the rear.)
The bladder assembly has a minimum clearance of 800mm which also needs to be taken into consideration.
While this instance is exaggerated It shows why You Can’t find the rectangle and work out the triangles
Now to make it into a formula I can use in a computer.

Your description isn’t perfect, but I think what You Are trying to do is calculate the volume of a space with a rectanular horizontal cross section, a flat top and an irregular bottom.

Your top and bottom may be the other way up, but the principal is the same.

If teh irregular side is flat, then you can simply take the average of your heights and use (average height)*base*width to calculate the volume. In the example given, I don’t Think You do have a flat side – there would need to be some sort of kink or curve on the surface to fulfill your description. In that case you’re going to have to learn a bit of integration…