解析 C。解析:圆的面积为π×3×3 = 9π平方厘米。设正方形边长为 a,则 a×a = 9π,所以 a = 3√π cm。A 选项边长为 3cm,面积为 9 平方厘米不等于圆面积;B 选项 3π cm 不是正方形边长;D 选项 9cm 边长的正方形面积为 81 平方厘米也不等于圆面积。
The area of a circle with a radius of 3 cm is ___ square centimeters. A. 3π B. 6π C. 9π D. 12π 相关知识点: 试题来源: 解析 C。本题考查圆的面积公式。半径为 3 cm 的圆的面积是 A = πr² = π×3² = 9π 平方厘米。反馈 收藏 ...
Radius (r): or Diameter (d): or Area (A): Unit of Lenght: Calculate Circumference Result: The circumference of a circle with radius 3.21 is 20.17(*) Formulas: r = 3.21 d = 6.42 C = 20.2 C = 2·π·r C = π·d C = √4·π·A π = 3.1415 ...
网络释义 1. 带半径圆 数控面板的专业英语,麻烦翻译一下... ... Circle with center = 带中心圆Circle with radius=带半径圆... sl.iciba.com|基于 1 个网页
π (Pi) times the Radius squared:A = π r2 or, when you know the Diameter:A = (π/4) × D2 or, when you know the Circumference:A = C2 / 4πExample: What is the area of a circle with radius of 3 m ? Radius = r = 3 Area= π r2 = π× 32 = 3.14159... × (3 ...
Here is the answer to questions like: how to find the area of a circle with radius 3501 miles?Circle Calculator Area Circunference Inputs: Radius: or Diameter or Circumference: Unit: Calculate Area Result: The area of a circle with radius 3501 is 38510000 Formulae: r = 3500 d ...
Area of a circle equals pi (~3.14) multiplied by the radius squared. So to find the area of that circle your equation is (3.14)(3)^2 which equals approximately 27.
( )A.1:2B.2:1C.2π:π+2D.π+2:2π 答案 C相关推荐 1Figure A is a circle with radius 6. Figure B is a bounded semicircle with radius 6. What is the ratio of the perimeter of A to the perimeter of B?( )A.1:2B.2:1C.2π:π+2D.π+2:2π 反馈 收藏 ...
In geometry, Arc is the part of circumference of a circle. It is a smooth curve with two end points. The length of the arc that subtend an angle (θ) at the center of the circle is equal 2πr(θ/360°). Learn more about arc at BYJU’S.
As in the figure.there are four circle with radius of 2.The four circles are apart from each other.Link their centers to form a quadrilateral.then the total area of the shaded parts in the figure is( ) A.2πB.4πC.6πD.8π