Assuming that you are determining the surface area of a rectangle, in order to perform the calculation you would multiply the length (10m) by the width (2m):
Surface Area = Length x Width
Surface Area = 10m x 2m
Surface Area = 20m^2
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A circle with a radius of 10m has an area of 314.16 m2
The area of a circle with a radius of 2m is: 12.566 m2
A rectangle measuring 3.2m x 10m has an area of 32m.
Since you didn't state If the 2m was a diameter or radius, it will have to be calculated as If it were both: Diameter: Pi x D = Area of Circle 3.14 x 2m = 6.28 m² Radius: Pi x R² = Area of Circle 3.14 x 2m² = 3.14 x 4 = 12.56 m²
58m