2. 职称英语
  3. If the diameter of a circle is 14, then the area of the circle isA、7πB、14πC、28

If the diameter of a circle is 14, then the area of the circle isA、7πB、14πC、28

游客2024-01-14  51
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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