Question

A corn cob like a cone has a radius of its broadest end as

3.5cm and length 21cm. If each 1sq.cm of the cob contains 5

grains, find how many grains the cob contains.
pls answer pls​

Answer 1

Answer:

A corn cob, 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 (approximately) you would find on the entire cob.CSA of cone cob = πrl

r=2.1cm,h=20cm

Now, l=

r

2

+h

2

=

(2.1)

2

+(20)

2

l=

404.41

=20.11cm

∴ CSA of corn cab =

7

22

×2.1×20.11=132.73cm

2

Number of grains on 1 cm

2

of the surface corn cob =4

∴ Number of grain on 132.73 cm

2

of the surface of corn cab =132.73×4≈531

solution

Step-by-step explanation:

this is not totally matching but some hint you can get from this.

Answer 2

Answer:

531 is the answer

Step-by-step explanation:

CSA of cone cob = πrl

r=2.1cm,h=20cm

Now, l= r 2+h 2= (2.1) 2+(20) 2

l= 404.41

​ =20.11cm

∴ CSA of corn cab =  22/7​ ×2.1×20.11=132.73cm^2

Number of grains on 1 cm^2 of the surface corn cob =4

∴ Number of grain on 132.73 cm^2 of the surface of corn cab =132.73×4

                                                                                                       =531

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