picture a sphere. the surface area of a sphere is 4*pi*r^2.
now, cut it in half. the surface area is 4*pi*r^2 / 2 =2*pi*r^2
this is without including the bottom circular base
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Surface area including the underneath of the hemisphere = pi*radius2 + 2*pi*radius2 Total surface area = 27pi square units
The surface area of a whole sphere, of radius r, is 4*pi*r2.The area of the curved surface of a hemisphere is, therefore, 2*pi*r2.The area of the flat surface is that of a circle of radius r, that is = pi*r2.So the total surface area of a hemisphere is 2*pi*r2 + pi*r2 = 3*pi*r2.
The curved surface area is 89.76527 units2 and the total surface area is 134.6479 units2
Surface Area = ~6,870.7 ft2
Volume = 2/3πr3 Surface area = 3πr2