007 - 008 Volume and surface area of earth and balloon

Example 007
A spherical balloon is inflated so that so that its diameter is 12 m. Find the surface area of the balloon’s covering and the volume of the gas.
 

Solution 007

 

Example 008
Find the volume and total surface area of the earth. (Consider the earth a perfect sphere of diameter 7960 miles.)
 

Solution 008

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