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For a radius of 5 centimeters the area are 78.53981633974483 square centimeters.
In international units of measure, it is exactly 5 square centimeters.
Put the 7cm and 5 cm rods together = 12 cm Put the 9cm and 2cm rods together = 11 cm Difference between is 1cm thus, you can use that difference to measure 1 cm.
5cm * 7cm = 35cm sq.
The area of square is : 400.0