Question 1114436
A stop sigh is a regular octagon. The manufacturer can make 6 stop signs from a peice  of 60 In by 90 in sheet metal. How much aluminum is left?

I already tried to find the area of 1 octagon by using the side length of 15 (even though one is not given) to find the perimeter and apothem, and put them in the area of a regular polygon formula, then multiplied the area I got by 6 and subtracted that number from the area of the aluminum, but I always got negative numbers because I ended up with the equation 5,400-6,518.4=-1,118.4 but since you can’t have a negative area, I know I’m doing it wrong.
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Obviously, the sides have to be less than 15 inches.
Even taking that into account, "stacking and packing" problems are not simple.
Octagons don't "mesh" like hexagons do, either.