Question

please solve this question... ​

Answer 1

this ques. is similar to the ques. of ch13 of maths Ncert example:6

first, we have to find: L = √r^2 + h^2

= √2^2 + 20^2 = √404 = 20.09

L by using the formula and the L is 20.09cm.

c.s.a= πrl

= 22/7×2×20.09

= 126.28 cm^2

no. of grains on the entire cob= 126.28×4 = 505.12 grains.