_m n_ + _l k_
-------------- × _m l′_,
2
the slope length of _m l_. Substituting dimensions, the area is
11 + 16
------- × 8.5 = 114.8 square feet.
2
As _k l x w_ is equal to _k n m l_, the area of both is 229.6 square
feet.
Adding the partial areas thus obtained, the sum is 155.3 + 402.8 +
107.2 + 288 + 229.6 = 1,182.9 square feet, or approximately 11.9
squares.