00:01
We're asked to find the circumference of a circle with a diameter of 8 inches.
00:11
So our diameter is 8 inches.
00:18
And so remember, the circumference of a circle is 2 pi r.
00:24
And where r is the radius of the circle.
00:28
And so we're given the diameter, and we should remember that the diameter is equal to 2 times the radius.
00:35
And so since we already know the diameter, we can solve for the radius by just solving this equation.
00:41
So we know that 8 is equal to 2 r, sorry.
00:47
And so we can divide both sides by 2 and we get 4 equals r.
00:50
In other words, if the diameter is 8 inches, our radius is going to be 4 inches...