A circular swimming pool has diameter 40 feet and is centered in a fenced-in square region measuring 70 feet by 70 feet. A concrete sidewalk 5 feet wide encircles the pool, and the rest of the region is grass, as shown in the figure below. (Round your answers to one decimal place.)   (a) Find the surface area of the water.  ft2 (b) Find the area of the concrete sidewalk.  ft2 (c) Find the area of the grass.  ft2

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