# Finding the volume of a sphere (diameter given)

by Sabrina
(USA)

##### Question
Find the volume of the sphere where its diameter is 15 inches. Take π=3.14.

Now, let's take a look at the sphere below:

Alright, since we are finding the volume of a sphere, we will be using the following volume formula:

where π is a number that is approximately equals to 3.14 (or use the number given to you) and r is the radius of the sphere.

Note that, to use the formula, we need the value of the radius. Since the radius is half of the diameter, we can find the value of the radius by dividing 15 with 2. This is shown below:

With the radius, r=7.5 inches, we can calculate for the volume of the sphere as shown below:

Now, it is important to include the unit. Since the radius is in inches. The volume will be in cubic inches. Therefore:

### Comments for Finding the volume of a sphere (diameter given)

Average Rating

 Mar 23, 2018 Rating FORTNITE NEW by: Ur dad Fortnite god here

 Feb 21, 2018 Rating Wrong answer at the last but right formula NEW by: Anonymous Sir the answer is wrong because the right answer is 1324.68750 or if you round up1324.69 baut thanks for the formula.

 Nov 14, 2017 Rating Very useful. NEW by: Ayuma Definitely helped me with what I was looking for... Getting through pre-recs, and needed a refesher on a few things, this being one of them. Thank you much!

 Jun 02, 2017 Rating >=( NEW by: Anonymous >=(

 May 11, 2017 Rating Good math! NEW by: msituA Bad trolls here VVVV

 Feb 17, 2017 Rating President U.S.A NEW by: Obama Trash just like Trump

 Jan 09, 2017 Rating horrible NEW by: Anonymous garbage trash shit

 Dec 01, 2016 Rating Expression NEW by: Anonymous Dont like much but its ok

 May 04, 2016 Rating Spam NEW by: Anonymous ( ͡° ͜ʖ ͡°)

 May 01, 2016 Rating Diameter of sphere NEW by: Anonymous Very helpful!!

 Apr 20, 2016 Rating Amazing NEW by: Anonymous Amazing

 Apr 20, 2016 Rating BAD NEW by: Anonymous Did not help at all. I expect better than that. More effort next time

 Apr 01, 2016 Rating Too long ago NEW by: jimbarry1946 I'm a retired math teacher, but it's been so many years since I used this I had forgotten the formula. I wanted to know how much the volume increased when the radius doubled. Now I know--it's eight times because the two is cubed. Thank you. Your page appears as if it would be very helpful for young people.

 Mar 01, 2015 Rating thanku it simple by: Perabet I understand clearly thanku

 Jun 15, 2014 Rating fantastic by: Anonymous I am very pleace because it help me when i could not remember it.

 Sep 04, 2011 Rating THANKS by: Anonymous That really helped me.

 Aug 24, 2011 Rating Volume of Sphere, given Diameter by: Ger Volume of Sphere = 0.5235988 X D^3

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