Reed uses 8 pieces of glass per square foot to make a stained glass window. how many pieces of glass will he need to make a window that is 864 square inches?

Convert 864 square inches to square feet.

1 square inch = 0.00694444444 square feet

Multiply 864 to it.

864 * 0.00694444444 = 6

Now multiply 8 to find out how many pieces of glass you need to use.

8 * 6 = 48

So you need 48 pieces of glass to make a window that is 864 square inches.