A park shaped like a square with a side of 30 metres has an alley with the width of 2 metres. What's the area of the green zone?

 A park shaped like a square with a side of 30 metres has an alley with the width of 2 metres. What's the area of the green zone?

A). 830 m²

B). 835 m²

C). 840 m²

D). 845 m²

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