F+G:
Then, add the elements that occupy the same position:
Solve
So, we find the element at address h31:
In this case, position h31 is - 8.0
(2,3) so x=2, y=3 and h=(2^2+3^2)^(1/2)=√13
sina=3/√13, cosa=2/√13, tana=3/2
Afterwards multiply sina and cosa by √13/√13 and get sina=(3√13)/13 and cosa=(2√13)/13
The formula for finding the area of a triangle is: base*height*1/2
So, if we use this information....
4.2*5.5*1/2=11.55
Area=11.55
If I am correct, the surface area of the prism should be 404ft.