If the diameter of a circle is 14, then the area of the circle is

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问题 If the diameter of a circle is 14, then the area of the circle is

选项 A、7π
B、14π
C、28π
D、49π
E、196π

答案D

解析 The diameter of a circle is twice its radius, so if the diameter is 14, then the radius is 7. The formula for the area of a circle is πr2, so the area of this circle is 49π.

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Seeingthesun______abovethesurfaceoftheseaweburstoutashoutofjoy.

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