2 X 3.14 X 5

Times Pi

v is an integer and pi (π) is the ratio of a circle's circumference to its diameter and is best known as 3.14. However, pi is an irrational number with an infinite number of decimals: three. 1 four 1 5 9 2 half-dozen 5 iii five 8 ix vii nine and and then on.

For most practical purposes, 5 times pi is merely 5 times 3.14 as illustrated beneath:

5 10 3.xiv =

15.7

Y'all tin make the answer more than accurate by using more decimals of pi. For example, here is v times pi with 12 decimal numbers:

5 10 iii.141592653589 =

fifteen.707963267945

If 5 is the bore of a circle, then 5 times pi is the circumference of that same circle. See definitions and explanations beneath to find out why!

Definitions

The radius (r) of a circle is the distance from the center of the circumvolve to the border of the circle. The diameter (d) of a circle is the distance from one point on a circumvolve through the centre to another point on the circle. In other words, two times the radius equals the diameter.

Like we said to a higher place, pi is the ratio of a circle'due south circumference to its bore. Therefore, nosotros can employ pi to calculate the area and circumference of a circumvolve.

Surface area

The formula to calculate the area of a circle is πr^two (pi times radius squared). If 5 is the radius, then the area of the circle is pi times five squared:

3.14 x 5^2 =

15.707963267945

If 5 is the bore, then you get-go have to divide 5 past 2 to get the radius and then summate pi times radius squared:

five / ii = 2.5
3.xiv x 2.5^2 =

19.625

Circumference

The formula to calculate the circumference is 2πr (ii times pi times radius). If 5 is the radius, then the circumference of the circle is ii times pi times 5:

2 x 3.xiv x v =

31.four

If 5 is the diameter, then you first have to divide 5 by 2 to get the radius and then calculate 2 times pi times radius:

5 / ii = 2.5
2 x 3.14 x ii.five =

15.7

Note: Instead of dividing 5 past 2 above, you could also accept simplified the formula because 2 times pi times radius is the same as pi times diameter. Thus, similar we said at the top of this folio, 5 times pi is the circumference of the circumvolve if 5 is the diameter.

Times Pi Calculator
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