Go here for our next pi calculation with explanation. Thus, like we said at the top of this page, 16 times pi is the circumference of the circle if 16 is the diameter.ĭo you need to multiply another integer with pi and get all the detailed information like you got for 16 times pi above? No problem, please enter another number below. Note: Instead of dividing 16 by 2 above, you could also have simplified the formula because 2 times pi times radius is the sameĪs pi times diameter. If 16 is the diameter, then you first have to divide 16 by 2 to get the radius and then calculate 2 times pi times radius: If 16 is the radius, then the circumference of the circle is The formula to calculate the circumference is 2πr (2 times pi times radius). If 16 is the diameter, then you first have to divide 16 by 2 to get the radius and then calculate pi times radius squared: In English a more explicit phase than -pi r squared- would be -pi times the square of r. Below is a radius calculator, which will compute a circles diameter, circumference, and area if you know the radius. Mathematically I would write this as pi r 2 since the convention is that you perform any exponentiations (the square) before multiplication. PIradiusradius double area Math.PI (radius radius) (The area of circle is: + area) //Circumference 2PIradius double. If 16 is the radius, then the area of the circle is Thus for your circle with diameter 4 inches the area is 3.1416 (2x2) 12.5664 square inches. The formula to calculate the area of a circle is πr^2 (pi times radius squared). Therefore, we can use pi to calculate the area and circumference of a circle. Like we said above, pi is the ratio of a circle's circumference to its diameter. In other words, 2 times the radius equals the diameter. One point on a circle through the center to another point on the circle. The diameter (d) of a circle is the distance from The radius (r) of a circle is the distance from the center of the circle to the edge of the circle. See definitions and explanations below to find out why! If 16 is the diameter of a circle, then 16 times pi is the circumference of that same circle. For example, here is 16 times pi with 12 decimal numbers: You can make the answer more accurate by using more decimals of pi. 1 4 1 5 9 2 6 5 3 5 8 9 7 9 and so on.įor most practical purposes, 16 times pi is simply 16 times 3.14 as illustrated below: This online calculator will calculate the 3 unknown values of a sphere given any 1 known variable including radius r, surface area A, volume V and circumference C. However, pi is an irrational number with an infinite number ofĭecimals: 3. Therefore, the area of the circle is 140.4 square inches.16 is an integer and pi (π) is the ratio of a circle's circumference to its diameter and is best known as 3.14. Finally, you would divide 1,764 by 12.57 and get 140.4. Then, square the radius and multiply it by to calculate the area. Then, you would multiply 4 by π and get 12.57. Divide the diameter by 2 to obtain the radius of the circle. For example, if the circumference is 42 inches, first you would square 42 and get 1,764. To find the area using the circumference, or the distance around the circle, use the formula area = c^2/4π, where c is the circumference. Therefore, the area of the circle is 314.16 inches squared. Then, plug the radius into the formula for finding area, area = πr^2. For example, if the diameter is 20 inches, you would divide that in half and get 10 inches. To find the area using the diameter, or the distance from one side of the circle to the other, first divide the diameter in half to find the radius. Therefore, the area of the circle is 113.04 inches squared. Then, you would multiply 36 by π and get 113.04. For example, if the radius of the circle is 6 inches, first you would square 6 and get 36. To find the area using the radius, or the length from the center of the circle to the edge, use the formula area = πr^2, where r is the radius. You can find the area of a circle using the radius, the diameter, or the circumference.
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