The side length of a square is equal to the diameter of a circle. It is known that the perimeter of the square is 20cm. How many square centimeters is the area of the square larger than that of the circle?

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• 19. A mathematics application problem is urgent! Xiao Liang's house painted the room and finished it after 10 days; he used 150 liters of certain paint, and the paint cost was 4800 yuan; the painting area was 130 square meters, and the final settlement of the payment was as follows: 1. According to the work, each worker was 30 yuan (one worker worked a day); 2. According to the paint cost, 30% of the paint cost was used as the payment; 3. According to the painting area, Pay 12 yuan per square meter. Which plan do you think is the most economical--
• 20. It is known that P is a point outside the parallelogram ABCD, the diagonal AC and BD intersect at O, and AP ⊥ CP