You just need to know either the diameter or radius. Make sure this is in metres. If you have diameter, half this to get radius. Then use the formula pi x r x r to get the area in m2
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A circle with a diameter of 1500mm has an area of 1.77 sq metres (approx).
Answer = 3.14 x 52 / 4 = 19.625 sq meters
225pi sq m
The conversion factor is 0.092903. So, 38 sq ft = 38 x 0.092903 = 3.53 (3.530314) sq meters.
The circle has the greater area. For a perimeter/circumference of 36 metres, Area of circle = 103.13 sq metres (approx) Area of 9*9 square = 81 sq metres Area of an L*(18-L) rectangle (L < 9 metres) = anything between 0 and 81 sq metres.