The formula for the surface area of a sphere is A=4pi r*2, where r is the length of the radius. Find the surface area of the sph
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Vector 
. 
. So the sum is 
.
For the second, the magnitude is the square root of the sum of the squares of the components. This is equal to
.
For the second, the magnitude is the square root of the sum of the squares of the components. This is equal to