So remember that the area of a triangle is
. Using this info, we can make the equation 
All you need to do is multiply everything, and your answer will be 
In short, the area is 7/12 yds^2
The area is 12412.50.
A = H times (B1 plus B2 divided by 2)
A = 75 (125 plus 81 divided by 2)
A = 75 (165.5)
A = 12412.50
Remember

and
so maybe we want to find a and b such that

24/2=12, so 12*2=24 so

24/3=8, so 8*3=24 so

so

I think those are in factored index form