What equal 6 when you divide by 3

If you want to know the number that equals 6 divided by 3, you can calculate this using the following step: 6 divided by 3 ... 6 / 3
6 / 3 = 2
The result is 2.

If you want to know the number divided by 3 which equals to 6, you can calculate this using the following step: 
the number ... n
n / 3 = 6     /*3
n = 18
The result is 18.

If the diameter is 8 than the radius is 4 because 2r or 2*radius equals the diameter. 4*2=8. 8/2=4.