解析 True 圆周长的计算公式有两种常见形式:C = 2πr 或 C = πd。其中,r是圆的半径,d是直径(d = 2r)。题目中给出的公式C = 2πr是通过半径直接计算周长,符合数学定义。公式推导基于圆周率π的定义(圆的周长与直径的比值),因此选项为正确。
The formula for the circumference of a circle is C = 2πr. What is the meaning of 'C'? A. center B. circumference C. chord D. cone 相关知识点: 试题来源: 解析 B。本题考查圆的周长公式中字母的含义。在圆的周长公式 C = 2πr 中,'C'代表周长(circumference)。A 选项 center 是圆心;...
Proof of the Area of a Circle Formula A = πr 2Chess, Caron
The area of a circle is pi times the radius squared (A = π r²). Learn how to use this formula to find the area of a circle when given the diameter.
This means that the first step to finding the volume of a cone is to find the area of its base, as described below. Finding the Area of the Base of a Cone An example of a cone. Dimensions depicted are measured in cm. The base of a cone is often a circle. This means that ...
The formula for the area of a circle is A = πr². What does 'r' stand for in this form
The diameter of the circle C. The length around the circle D. The area of the circle 相关知识点: 试题来源: 解析 C。本题考查圆的周长公式中“circumference”的含义。选项 A 是圆的半径;选项 B 是圆的直径;选项 D 是圆的面积。而“circumference”指的是圆的周长,即围绕圆的长度,选项 C 正确。
The space occupied by a solid sphere is called the volume of the sphere. Learn how to deduce its formula and determine the volume of the sphere using examples.
Radius of the CircleAll points on the boundary of a circle are at an equal distance from its center. The radius is the distance from the center of the circle to any point on the circumference of the circle. It is half the length of the diameter....
The radius of a circle is defined as a line segment that joins the center to the boundary of a circle. The distance from the center point to any endpoint on the circle is called the radius of a circle. Learn about the radius formulas with solved examples