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The formula for the surface area of a hemisphere is 2Ï€r^2, where r is the radius.
Substitute r = 10m into the formula:
Surface area = 2Ï€(10m)^2
Surface area = 2Ï€(100m^2)
Surface area = 200Ï€ m^2
Therefore, the surface area of a hemisphere with a radius of 10m is 200Ï€ square meters.