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1 metre = 100 cm Therefore 15 meters = 15*100 = 1500 cm
The length of the diameter will be 30 cm if the radius is 15 cm.
4*15 cm = 60 cm
Area = 15*15 = 225 sq cm
Because 12 meters equals 1200 cm and 1200 cm plus 15 cm = 1215 cm