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A corn cob, shaped like a cone, has the radius of its broadest end as 1.4 cm and length (height) as 12 cm of the surface of the cob carries an average of four grains, find how many grains approximately you would find on the entire cob.

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211

212

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answer is C.

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Detailed Solution

Here, it is given that the radius of its broadest end is 1.4 cm and length (height) as 12 cm of the surface of the cob.
It is given that r = 1.4 cm and h = 12 cm.
Now, using the formula

find l of the cone.
Question Image

The C.S.A. of the cone is given by

Thus, the area of the cone cob is

It is also given that, number of corn grains in the

Thus, the number of corn grains carried in

approximately. (Option 3)

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