If the area of a circle is 81π, then the diameter of the circle isA、9B、18C、36

游客2025-02-27 22

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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If the area of a circle is 81π, then the diameter of the circle isA、9B、18C、36

Iftheareaofacircleis81π,thenthediameterofthecircleisA、9B、18C、36

Inthefigure,Oisthecenterofthecircleandtheareaofthecircleis4π,w

Inthecoordinateplane,pointsAandBareendpointsofadiameterofacircle

[img]ct_gre5image002[/img]Thediameterofthecircleis10.ColumnA

[img]ct_gre5image016[/img]Thecirclesabove,withcentersOandP,eachhavera

Whatistheareaofacirclewithacircumferenceof14πinches?Theequationf

Whatistheareaofacirclewhoseradiusisthediagonalofasquarewhosearea

Whichofthefollowingpointsliesintheinteriorofthecirclewhoseradiusis

Tiffanyinflatesabeachball.Ifthediameteroftheballis0.6m,whatisits

Whatistheareaofacirclewithacircumferenceof14πinches?49πTheequation

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[originaltext]A:Duringthisyear’sSpringFestival,thousandsofcinemaswere

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实现母乳喂养的促成因素是A.母亲愿意进行母乳喂养 B.母亲了解母乳喂养的好处

王某，颈前肿胀5个月，伴眼突，烦躁易怒，手指颤抖，多汗，面红目赤，头晕目眩，口苦

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