A practical problem, a formula, The length of a rectangular wheat field is 100 meters and the width is 60 meters. How many sprinkler irrigation devices are needed if the automatic rotary sprinkler irrigation device with a range of 100 meters is used for sprinkler irrigation?

A practical problem, a formula, The length of a rectangular wheat field is 100 meters and the width is 60 meters. How many sprinkler irrigation devices are needed if the automatic rotary sprinkler irrigation device with a range of 100 meters is used for sprinkler irrigation?

100 * 60 = 6000 (M2)
3.14 * 100 * 100 = 31400 (M2)
One is enough. I think the question should be wrong, or you have the wrong number. The range should be 10 meters, right?