The radius of a circle is 5 cm. What is the diameter of the circle? A. 2.5 cm B. 5 cm C. 10 cm D. 15 cm 相关知识点: 试题来源: 解析 C。圆的直径等于半径的两倍。已知半径是 5 厘米,所以直径是 10 厘米,选项 C 正确。选项 A 数值错误;选项 B 是半径的长度;选项 D 计算错误。
B. The distance from the center to any point on the circle. C. The distance around the circle. D. The number of points on the circle. 相关知识点: 试题来源: 解析 C。原因:文中提到“The circumference of a circle is the distance around it.”。 反馈 收藏 ...
What is the diameter of a circle (in units) with the center at {eq}(-5, 3) {/eq} and tangent to the line {eq}8 - 2x = 2 {/eq}? Radius of a Circle: We find a circle's radius by finding the distance between the center and the coordinate o...
A = C24πSee below some definitions related to the formulas: Circumference Circumference is the linear distance around the circle edge. Radius The radius of a circle is any of the line segments from its center to its perimeter. The radius is half the diameter or r = d2. Diameter The...
Problem Solving 试题详情 题目: In the figure below,Ois the center of the circle. What is the area of the circle? 选项: A、A 2π B、B 3π C、C 5.5π D、D 7π E、E 9π 答案: E
The circumference of a circle is 18.84 meters. What is the diameter of the circle? A. 3 meters B. 6 meters C. 9 meters D. 12 meters 相关知识点: 试题来源: 解析 B。本题考查圆的周长计算。圆的周长公式为 C = πd,已知周长为 18.84 米,π取 3.14,则 d = 18.84÷3.14 = 6 米。选项...
A. 6 meters B. 8 meters C. 10 meters D. 12 meters 相关知识点: 试题来源: 解析 A。本题考查圆的面积公式。圆的面积公式是πr²,已知面积是 36π,那么 r²=36,r=6,所以答案是 A。B 选项不是圆半径的值;C 选项不符合圆面积公式计算结果;D 选项也不正确。反馈...
Since the radius twice is the diameter of the circle, the area formula can also be written as: $$A = \pi \ \left( \dfrac{d}{2} \right)^2 = \dfrac{\pi}{4} (d)^2 $$ That is, the area of a circle is proportional to {eq}r^2 {/eq} or {eq}\dfrac...
The circumference of a circle is the line drawn around the outer edge of the circle. The area of a circle is the total area within the circumference of a circle. Both formulas use the radius of the circle, a line drawn from the center of the circle to the outer edge....
2*pi(如果你取3.14的话）*12=circumference of the whole circle(得到整个圆的周长）=75.36ft 然后圆心角(60/360)*75.36=12.56ft,就这么算