If the area of a circle is 81π, then the diameter of the circle is

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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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本试题收录于： GMAT QUANTITATIVE题库GMAT分类

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SpeakerA:IhaveanadmirationforChineseKungFu.BruceLee,JetLiandJackieChanareverypopularinmoviescircle.Speak

SpeakerA:Hello.CanIbeofservicetoyou?SpeakerB:I’mjustwindowshopping.SpeakerA:Youarealwayswelcome.【D8】_____

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