At a lumber company, shelves are sold 4 types of wood, 3 different widths, and 6 different legths. how many different types of shelves could be ordered

To determine how many different types of shelves could be ordered, you will multiply all the numbers from each different aspect of the shelves to create all the possible combinations that could occur.

The reason for doing this has to do with the groupings that will occur using all three numbers.

4 x 3 x 6 = 72 

There are 72 different possibilities of shelves.

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