A convex polygon has vertices at the points (2, 0), (1, 0), (-2, 5) and (-2, 4). What is the area of the polygon?
Area of large rectangle = 4 * 5 = 20
Area of larger right triangle at right = (1/2) 4 * 5 = 10
Area of smaller right triangle at left = (1/2) 3 * 4 = 6
Area of polygon =
20 - 10 - 6 = 4
