2. 外语
  3. In the figure above, a square is circumscribed about a circle with a diameter of 20 cm. Points Q, R, S, and T are the midpoints

In the figure above, a square is circumscribed about a circle with a diameter of 20 cm. Points Q, R, S, and T are the midpoints

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问题
In the figure above, a square is circumscribed about a circle with a diameter of 20 cm. Points Q, R, S, and T are the midpoints of the square’s sides. What is the total area, in cm2, of the square?
______ cm2
选项
答案400
解析 The correct answer is 400. To solve this problem, note that the diameter of the circle is 20 cm, which means that each side of the square is 20 cm. The area of the square is 20 cm×20 cm, which equals 400 cm2.
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