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A corn cob (see Fig.), shaped somewhat like a cone, has the radius of its broadest end as \(2.1 cm\) and length (height) as \(20 cm\). If each \(1 cm^2\) of the surface of the cob carries an average of four grains, find how many grains you would find on the entire cob.
 
YCIND_240304_6078_corn.png
 
Number of grains \(=\)