The area of a circle is: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× ...
The formula for the area of a circle is π x radius2, but the diameter of the circle is d = 2 x r2, so another way to write it is π x (diameter / 2)2. Visual on the figure below: π is, of course, the famous mathematical constant, equal to about 3.14159, which was origina...
. The radius of the circle is cm, the diameter of the circle is cm, and the circumference of the circle is cm. (π≈3) 相关知识点: 试题来源: 解析 5;10;30 Area=π(r^2)=75 cm2. r=5 cm. d=2r=10 cm. Circumference=πd=10*3=30 cm....
If the radius of the circle is the same as the diagonal of a square, what is the area of the square? (Take π=3.14) 一个圆形的面积为12.56厘米.若正方形的对角线和圆形的半径相同.求该正方形的面积.(取π=3.14) 相关知识点: 试题来源: 解析 2. 12.56÷3.14=4, ∴2×2÷2=2. 反馈 ...
So, the area of the circle is 706.5 mm2 Example 2 Calculate the area of the circle shown below.SolutionA = πr2 square units = (3.14 x 282) cm2 = (3.14 x 28 x 28) cm2 = 2461.76 cm2 Example 3 The area of a circle is 254.34 square yards. What is the radius of the circle?
About Area of a Circle Calculator The Area of a Circle Calculator is used to help you find the area of a circle. Area of Circle Formula The following is the calculation formula for the area of a circle: A = πr2 Where:A = area of a circleπ = 3.141592654r = radius of the ...
Area of a Circle = πr² Where: -π (pi) is a constant approximately equal to 3.14, - r is the radius of the circle. 1.Identify the radius: The radius given isr=√5cm. 2.Substitute the radius into the area formula: Area=πr2=π(√5)2 ...
The area of a circle is 3.14 square decimeters. What is the radius of the circle? A. 1 decimeter B. 1 meter C. 1 kilometer D. 1 millimeter 相关知识点: 试题来源: 解析 A。圆的面积公式为πr²,已知面积为 3.14 平方分米,π取 3.14 时,半径 r 的平方为 1,所以半径为 1 分米。选项 ...
The radius of a circle is 3 cm. What is the area of the circle? A. 28.26 cm² B. 18.84 cm² C. 9.42 cm² D. 14.13 cm² 相关知识点: 试题来源: 解析 A。面积 = 3.14×3×3 = 28.26cm²。B 选项 18.84 是圆的周长;C 选项 9.42 计算错误;D 选项 14.13 计算错误。
Dimensions of a Circle: 2πr r πr2 Answer and Explanation:1 Let us assume that the radius of the circle can be given byr. The circumference is then given by2πr. Equating to the... Learn more about this topic: Radius of a Circle Formula & Example | How to Find the Radius of ...