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

游客2025-02-27 7

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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十九届二中全会强调,2018年即将修改的宪法必须贯彻以下原则()A.坚持党的领

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