CPM Homework Help : CCG Problem 6-77

A shaded figure. Draw right, 6, diagonally down 1 and right 1, down 3, left 2, down 2, right 3, down 3, left 6, diagonally up 2 and left 2, and up 7 to enclose the figure. A map of an island is shown at right. Each unit of length on the grid represents $32$ feet.

Hint:

Divide the figure into smaller shapes to make parts (a) and (b) easier to solve.

Find the actual dimensions of the island (the overall width and length).
Find the area of the shape at right and the actual area of the island.