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A math problem in grade six (about circle)
According to the formula S=πr

2

If you have any questions, you can know.

The radius of the big circle is twice that of the small circle, so the area of the big circle is four times that of the small circle, and the area of the big circle is more than that of the small circle 12 square meter.

It is known that the area of a small circle is 12 divided by 3 equals 4 square meters.