Not sure, but the areas of a triangle is BH/2 so the dimensions should be 8 and 6 then 10.
8 x 6 = 48
48/2 = 24
Maybe that can help with the equation
It is 800 because the 4 can not tell the what to do so that it is
To find area you do length x width. To find perimeter you do length + width.