Find the radius, r cm, of a circle, given that a sector of the circle has an area of (9π )8 cm2 and the sector subtends an angle of (π )4 radians at the centre of the circle. 相关知识点: 试题来源: 解析 3 cm 反馈 收藏 ...
The radius of a sphere or a circle is the distance from its center to its circumference. For any regular polygon, the radius is the same from the center to all its vertices. A circle is a regular polygon where the distance from the center to any of its edges is the same. The radius...
Example 3. Find the area of a semicircle? From the given figure: Solution: The area of the semicircle is one-half the area of a circle with a diameter of 40 feet. The radius of the circle is\( \frac{40}{2}=20 \)feet.
To find the area of a circle given the radius,plug in the value of the radius to the formula A = pi r^2. To do this, first you square the radius, then you multiply the result by pi. If the radius of your circle is 2, write out of your formula using 2 instead of r: A = ...
, find the circumference and the area of the circle. (π=3.14) 相关知识点: 试题来源: 解析 62.8cm, 314cm2.结果一 题目 Given that the radius of a circle is 10cm, find the circumference and the area of the circle. (π=3.14) 答案 62.8cm, 314cm2.Circumference:2πr=2×3.14×10=62.8...
The circumference a circle can also be represented in terms of the radius of the circle.We can define the radius of a circle in terms of the diameter through the relationship: d=2∗r Substituting this into the previous equation to find circumference of the circle, we get: ...
Because all circles have the same shape, their different measurements are related by a set of simple equations. If you know the radius, diameter, area or circumference of a circle, it is fairly easy to find any of the other measurements. ...
The radius is used to define the diameter, circumference, and area of the circle. The diameter of the circle is a straight line through the center point. So, the length of a diameter is given by twice the radius. That is, d=2r. Circles have an angle of 2π and a radius of r. ...
定义一个circle类,属性有radius方法有findarea()得到面积,创建半径为5和4的圆并输出相应的圆的面积 相关知识点: 试题来源: 解析 public class Wb { double i = 5.0; double findArea() { return radius*radiu*3.14159; } public static void main(string []args) { TeastCircle myCircle = new TeastCircle...
In this program, we will java Program see how to calculate the area of a circle when the radius is given.