Weekend commentary: Circle gets the square

The area of a circle = pi (r squared). But pi is not part of the formula for the area of a rectangle, which is length x width. In figuring the area of a circle, there is instead one radius. Just multiplying the radius by itself would not compute it accurately.How to find the circumference of a circle and more

For example, this: circumference = 3.1416 * (radius * 2); is mathematically sound under the distributive property, but initially it looks like the area formula area = Pi * r^2 ... Enter the x and y coordinates of the center of the circle: "; cin >> x1 ...Mathematics Upstarts Look to Replace Pi With New Circle Constant

As supporting evidence Dr. Hartl points to many formulas, like the Gaussian distribution, Fourier Transform, and, of course, the circumference formula ... Area_circle= πr 2 than Area_circle = τr 2 /2. And that, one could suppose, is cause enough for some ...- for instance if they select "circle" it asks "what is the center point's X coordinate"... "what is the Y coordinate"... "what is the radius ... the area that is output is either double the actual or half of the actual. I am trying to use the formula ...
- Want to make the calculation for yourself? Well, the formula for calculating the circumference of a circle is 2 x pi x r, where R is the radius of the circle. The equatorial radius of Saturn is 60,268 km, so you can do the math yourself. Of course ...

- If the radius of a circle is increased by a factor of x, then is the area of the circle increase by x?
- What is the area of a circle with a radius of 2 inches? Use 3.14 for pi, please?
- What is the radius if the area is 25?
- If area = pi r2 then what is the radius of 2?
- What is the surface area of a sphere with a radius of pi centimeters?
- What is the area of a circle in terms of pi when the radius of the circle is 5m?
- What is the area and circumference of a 10in radius? Give answers in terms of pi?
- What If the lateral area of a cylinder is 18 pi, and the height is 6 what is the radius?

- circumference of a circle - About.com Mathematics... circumference, diameters, pie and radius ... Area or Circumference, ... of a circle is the actual length around the circle which is equal to 360°. Pi (p) ...
- How to Find the Area of a Circle Using Radius | eHowHow to Find the Area of a Circle Using Radius. The area of a circle is ... The circumference and area of a circle ... circle, use this formula: Area equals pi ...
- Circumference - Math GoodiesCircumference of a circle is presented in this interactive lesson from Math ... (and radius) of a circle given the circumference. ... Circumference and Area Lessons:
- Circles - MathDiameter = 2 x radius of circle. Circumference of Circle = PI x diameter = 2 PI x radius where ... then area = ((/(2PI))x PI r 2. Equation of Circle: ...
- Area of a Circle - WKUWhy is the area of a circle pi times the square of the radius? ... so that the circumference of a circle is pi times the diameter, or 2 pi times the radius.