Surface area of a sphere = 4*pi*radius2
Surface area = 4*pi*42 => 201.0619298
Surface area of the sphere = 201 square units correct to three significant figures.
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The surface area of the sphere with the radius doubled is 200 units2.---> Confirmed
Surface area of a sphere = 4*pi*radius squared
The surface area of a sphere with a radius of 2 is about 50.27 units2
Given a sphere of radius r, Surface area = 4{pi}r2 Volume = (4/3){pi}r3
The surface area of a sphere with a radius of 7 is about 615.8 units2