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 ...
The area of a circle with a radius of 3 cm is equal to the area of a square. What is the side length of the square? A. 3 cm B. 3π cm C. 3√π cm D. 9 cm 相关知识点: 试题来源: 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,...
Example 1: Find the area of a circle with a radius of 3 centimeters. Solution: Given, r = 3 cm The area of a circle is \({\pi}r^2\). \({\Rightarrow}A={\pi}{\times}3^2\) \({\Rightarrow}A=9{\pi}\) (Substituting the value of pi) ...
The area of a circle with a radius of 5 cm is ___. A. 25π cm² B. 10π cm² C. 5π cm² D. 75π cm² 相关知识点: 试题来源: 解析 A。本题考查圆的面积计算公式,圆的面积 = π×半径²。半径为 5cm,所以面积为 25π cm²。选项 B 计算错误,应为 25π cm...
If we have a circle in a square and r is the radius of the circle and x is the measurement outside the square. What will be the formula to find the area of the whole square using x and r? If the area of a circle is equal to the area of...
The area of a circle having a radius ‘r’ (The distance from the centre to a point on the boundary) is given by πr2where π = $\frac{22}{7}$ or 3.14 (approx.) Let us understand it through an example. Suppose we have a circle that has a radius of 7 cm. Its area will be...
Radius (r): or Diameter (d): or Area (A): Unit of Lenght: Calculate Circumference Result: The circumference of a circle with area 3π is 10.88(*) Formulas: r = 1.73 d = 3.46 C = 10.9 C = 2·π·r C = π·d C = √4·π·A π = 3.1415 A = area...
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.
Radius: or Diameter or Circumference: Unit: Calculate Area Result: The area of a circle with radius 65 is 13270 Formulae: r = 65 d = 130 C = 408 A = πr2 = π(d2)2 A = C24π π = 3.1415 A = area C = circumference or perimeter r = radius, d = diameter Solut...
1【题目】5Given that the area of a circle with radius 10 cm is equal to the area of asector with centralangle 40°, then the radius of the sector iscm. 25 Given that the area of a circle with radius 10 cm is equal to the area of a sector with centralangle 40°, then the radiu...