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If the area of a circle is 81π, then the diameter of the circle isA、9B、18C、36
If the area of a circle is 81π, then the diameter of the circle isA、9B、18C、36
游客
2024-01-14
26
管理
问题
If the area of a circle is 81π, then the diameter of the circle is
选项
A、9
B、18
C、36
D、9π
E、18π
答案
B
解析
The formula for the area of a circle is πr2. Therefore, the radius of this circle is the square root of 81, or 9. The diameter is twice the radius, so 18.
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