A certain person owned the three square fields shown in the figure containing 18, 20, and 26 acres. In order to fence the property, the person bought the four intervening triangular fields. What is the area of the estate?
Alternate Problem 29
Find the area of a quadrilateral whose vertices have coordinates (-10, -3), (-2, -5), (4, 7), and (-4, 8).
Extension Problem 29
If a vertex angle of a square with sides measuring 4 units is trisected, the following figure results: