The formula for the circumference of a circle is C = 2πr, where r is the ___. A. radius B. diameter C. area D. perimeter 相关知识点: 试题来源: 解析 A。本题考查圆的周长公式中半径的作用。在圆的周长公式 C = 2πr 中,r 表示半径。反馈 收藏 ...
Example 1: If the radius of a circle is 30 cm, find its circumference. Solution: r = 30 cm Use the formula to find the circumference of a circle: C = 2\(\pi r\) [Write the formula] = 2 x 3.14 x 30 [Substitute the value of r and \(\pi\)] = 6.28 x 30 = 188.4 Therefor...
The formula for the circumference of a circle is _. A. π×radius² B. 2×π×radius C. 4×π×radius D. π×diameter 相关知识点: 试题来源: 解析 B。本题考查圆的周长公式。选项 B 是圆的周长公式,2 倍圆周率乘半径。选项 A 是圆的面积公式。选项 C 错误。选项 D 圆周率乘直径也等于圆...
Find the circumference of the circle x^2+y^2=3^2, i.e., the arc length of the plane curve x=3 \cos t, y=3 \sin t, where 0 \leq t \leq 2 \pi. The circumference is \int_{0}^{2 \pi} f(t) dt. Find the radius of a circle whose circumference is e...
256K Discover how to find the area and circumference of a circle. Learn the area of a circle formula, the circumference of a circle formula, how to calculate the circumference of a circle, and how to calculate the area of a circle. Related...
The formula for the circumference of a circle is ___. A. 2 ×π× radius B. π× radius × radius C. 2 ×π× diameter D. π× diameter × diameter 相关知识点: 试题来源: 解析 A。本题考查圆的周长公式的英语表达。选项 B 是圆的面积公式;选项 C 中 2 应乘以半径,不是直径;选项...
what is the formula to find a sector in a circle? so I'm given the radius and the arc of angle 60 degrees. To find the area in that arc, the forumla is...
结果1 题目 The formula for the circumference of a circle is C = 2πr. If the radius of a circle is 5 cm, what is the circumference? A. 10π cm B. 15π cm C. 20π cm D. 25π cm 相关知识点: 试题来源: 解析 C。周长 C = 2π×5 = 10π cm。 反馈 收藏 ...
1. Identify the value of the radius. 2. Apply the formula of the circumference. C=2πr 3. Simplify. Answer and Explanation: We are given a circle with radius r=22 mi. We are required to find the circumference of the circle. First, to find the.....
Answer: The circumference of a circle is the edge or rim of a circle itself. It is the equivalent of 'perimeter' for a circle. The glowing part in the circle above is the circumference. Formula for circumference You can use either of the formulas below to find the circumference . One ...