SOLUTION: A symmetrical cross of thickness 12cm is to be cut out from a piece of cardboard of radius 20cm. what percent of the area of the cardboard is considered as waste?

Question 1143512: A symmetrical cross of thickness 12cm is to be cut out from a piece of cardboard
of radius 20cm. what percent of the area of the cardboard is considered as waste?
Answer by greenestamps(13200) (Show Source): You can put this solution on YOUR website!

I see the "symmetrical cross of thickness 12 cm" as being made up of five squares, each with side length 12cm. The area of the cross is 5*12^2 = 720 square cm.

The area of the cardboard is pi(20^2) square cm.

The percent of waste is , converted to a percent.

You can do the calculations.
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