The area of the cross, formed by cutting four equal squares from a larger square equals 20. The perimeter of the cross equals
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i don't know answer
Step-by-step explanation:
A picture will tell you everything. The "regular polygon" part is intended to tell you that all sides of the cross are of equal length.
The picture will tell you that the cross is made up of 5 squares. The total area is 20, so each of the 5 squares has area 4, and therefore side 2. Now you know enough to find the perimeter.
There is no need for formulas, just add up. But you might notice something nice. The cross was made by cutting out 2×2 squares from the corners of a 6×6 square. How is the perimeter of the cross related to the perimeter of the original square?
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