the first term in the answer represents the area of the two triangles
the second term represents the area of two of the rectangular sides (find that the other side equals 5 w/ pythagorean theorem square root(4^2 + 3^2) = square root (16 + 9) = square root (25) = 5)
the third term represents the area of the bottom rectangular side with side lengths being 6 and 8
