题目The area of a circle is 154 square meters. What is the radius? (Use 3.14 for π) A. 7 meters B. 8 meters C. 9 meters D. 10 meters 相关知识点: 试题来源: 解析 A。圆的面积公式为面积=π×半径×半径,154 = 3.14×半径×半径,半径×半径 = 154÷3.14 = 49,半径 =...
结果1 题目The area of a circle is 28.26 square meters. What is the radius? A. 3 meters B. 4 meters C. 5 meters D. 6 meters 相关知识点: 试题来源: 解析 A。圆的面积=π×半径的平方,28.26÷3.14=9,9 开平方为 3 米。反馈 收藏 ...
A circle is probably the most common enclosed two-dimensional figure in ordinary geometry. Whenever we study the circle, we discuss its circumference, area, and diameter.The important formulas related to the circle are as follows:{eq}\text{Area of the circle}, A=\pi {{r}^...
GMAT 考满分题库The radius of a circle is 10. The area of the sector(fan-shaped) whose center angle is x is A. Which of the following formulas can express A in terms of x?
Area of a Circle = πr² Where: -π (pi) is a constant approximately equal to 3.14, - r is the radius of the circle. 1.Identify the radius: The radius given isr=√5cm. 2.Substitute the radius into the area formula: Area=πr2=π(√5)2 ...
The area of a circle is 49π square meters. What is its radius? A. 7 meters B. 14 meters C. 21 meters D. 28 meters 相关知识点: 试题来源: 解析 A。本题考查圆的面积公式的逆运算。圆的面积公式是 S=πr²(S 是面积,r 是半径),已知面积是 49π 平方米,那么 r²=S÷π=49π÷...
The area of a circle is 78.5 square meters. What is the radius? (Use 3.14 for π) A. 5 meters B. 10 meters C. 15 meters D. 20 meters 相关知识点: 试题来源: 解析 A。圆的面积=π×半径的平方,78.5÷3.14 = 25,半径 = 5 米。
If the area of a circle is A = (pi)r^2, what is the radius in terms of the area? Solving an Equation for a Specified Variable: In mathematics, when given a formula/equation containing multiple variables, we can solve for one of the variables to get that va...
What is the rate of change of the area of a circle with respect to the radius when the radius is r = 3? Circle: The circle is a two-dimensional figure or shape. In other words, the circle is defined in 2-D figure. Letrbe the radius of a circle...
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 diameter of a circle is any straight line segment that passes through the center of the circle and whose endpoints lie on the circle. ...