Let the lawn radius be x meters.
2x+2x×3. 14÷2= 128.5
2x+3. 14x= 128.5
5. 14x= 128.5
X = 25
(25m)？ ×3. 14=625m？ ×3. 14= 1962.5m？
A: Lawn area 1962.5 square meters.
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