A rectangular pool has side lengths of 12 yards and 6 yards. An octagon is drawn around the pool. The octagon has 2 sides with lengths 12 yards, and 6 sides with lengths 6 yards. The area between the rectangle and the octagon is shaded. How many square yards of cement are needed to create the walkway around the rectangular pool? 176 square yards 196 square yards 208 square yards 280 square yards