Assuming you mean the circle has a 3.5 meter radius, the area of a circle is Pi * r2, so 3.14 * 3.5 * 3.5 = 38.465 m2.
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A 7-meter diameter circle has an area of 38.5 square meters.
There is no formula - it is an invalid conversion. Meters are a measure of length or distance and square meters are a measure of area.
Invalid conversion: square meters is a measure of area and linear meters is a measure of length or distance.
The area is 78.54 square meters.
The area of a 9-meter diameter circle is 63.617 square meters.