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Math topic: There is a circular square in Longgang District. Please measure the required data and calculate the area of this square.
Measure the diameter or radius of a circular square on the map, calculate the actual diameter or radius of the circular square according to the scale in the map, and then calculate the actual area of the square with the area formula of the circle:

1.25*20=25 (m)

25 * 25 * 3.14 =1962.5 (m2)