In mathematics, the formula for the area of a circle is pi times the radius squared. If the radius of a circle is 4 centimeters, what is the area? A. 16 pi square centimeters B. 12 pi square centimeters C. 18 pi square centimeters D. 14 pi square centimeters ...
找出下面代码中的错误。ifradius>=0{area=radius*radius*PI;System.out.println("Theareaforthecircleof"+"radius"+radius+”is"+area);} 相关知识点: 试题来源: 解析 第一个错误是在if语句的条件判断中,缺少了一个右括号,应该是ifradius>=0),表示判断半径是否大于等于0。第二个错误是在计算圆的面积时,多...
Before explaining the formulas, there is a special number used in math called pi. Pi is a ratio of the circumference of a circle to its diameter. This ratio is true for all circles and we can use the approximated value of 3.14 or if using a calculator, use the pi button which looks ...
Circle, geometrical curve, one of the conic sections, consisting of the set of all points the same distance (the radius) from a given point (the centre). A line connecting any two points on a circle is called a chord, and a chord passing through the cent
Circumference of a Circle = 2πr, where r = Radius of the circle Now, what is instead of the radius we are given the diameter of a circle, how do we calculate the circumference? Since, diameter ( d ) = 2 x radius, we substitute 2r = d in the above equation to get, ...
In mathematics, when given a formula/equation containing multiple variables, we can solve for one of the variables to get that variable in terms of the other variables. To do this, we simply treat the other variables in the equation as if they were numbers, and ...
If we change the radius in a factor ofn, we have: A=π(nr)2=n2πr2 Using the area for the initial circle {eq}A=\pi... See full answer below. Learn more about this topic: Finding the Area & Circumference of a Circle from ...
the radius should be a float type. float radius; PI needs to be a float of value 3.14159 float PI = 3.14159; you didn't read my answer that mentions the formula to use for the area of a circle. it should also be a float type. floa...
Measuring the radius of a sphere is not that easy. You can wrap a string around it and hope you got the great circle, or you can be a bit more creative: Fill an open container (of which you know the surface area) with water. Mark the water level. Submerge the ball (using your ha...
The formula for the circumference of a circle isC=π×dC=π×d, or it can be written asC=2×π×rC=2×π×r. Either one works! Now, you may be asking, “Well where did pi come from, and why do we all the sudden get the circumference if we multiply said pi by our diameter?