00:01
I am going to find the volume of a sphere.
00:08
And the first thing that i'm going to do is draw that sphere.
00:12
So my sphere is a circle.
00:16
And i have this nice little illusion of three dimensions.
00:20
That's really not good though.
00:23
There we go.
00:24
That's like a teeny bit better.
00:26
And i am told that the radius is 1 .2 meter.
00:33
And now i'm going to write the formula i need.
00:36
I always write the formula second.
00:38
That's my next step.
00:40
So the volume of a sphere is four thirds pi r cubed.
00:46
And then i'm going to determine my variable.
00:50
So the values.
00:50
I need the radius.
00:52
And fortunately, i am given the radius.
00:54
I don't have to find it or convert to it from the diameter.
00:58
So i have the radius.
00:59
And now i'm going to substitute that value into my formula.
01:05
So i have four -thirds pi, 1 .2 cubed.
01:13
And now all i'm going to do is solve it.
01:15
So i get the volume of the sphere.
01:20
It's four -thirds pi.
01:22
And then we have 1 .2 cubed, which is 1 and 728 ,000s.
01:33
And then i'm going to multiply that by pi...