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Find the surface area of the full sphere [ A = 4 pi R2 ] and then take half of it.
You wind up with [ 2 pi R2 ] for the outside surface area of a half sphere, or
[ 4 pi R2 ] for the (inside + outside) surface area of the half sphere. (Since
the inside and outside are now both exposed to the weather, you probably
want to paint both surfaces.)
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How do you figure out surface area for half sphere?
To do this question, we have to ask ourself, what formula do you use to find the surface area of a sphere. The answer should be known to you, but it is 4πr2. Since we know how to find the surface area for a full sphere, then finding the surface for a half sphere is just half the job. You use the formula for the full sphere 4πr2, and divide it by 2... so (4πr2) / 2 . Voila!
Why isn't the surface of a hemisphere not half the surface area of a sphere?
The surface area of a semicircle has the round surface which is half a sphere and also has the flat surface which is a circle.
What is the surface area of a half-sphere with a radius of 10?
Surface area of half a sphere = 2*pi*radius2 Surface area = 200*pi = 628.3185307 square units.
What is the surface area of half a sphere with a radius of 4?
100.48
Find the total surface area of this half sphere with a radius of 10?
Total surface area = (2*pi*r2)+(pi*r2) Area = 300*pi in square units
