Question

A corn cob, shaped some what like a cone has the radius of its broadest end as 2.1 cm and length as 20 cm. if each 1cm square of the surface of cob carries an average of four grains. Find how many grains you would find an entire cob​

Answer 1

Answer:

531

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 =  

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

Answer 2

Please refer to the attachment ✌️