Why we add only r ....I think 2r shd be added...plz reply fast

9

Aditya Vishwakarma answered this

I thick short method to solve this question is given by me . Hope this helps you.
All above are wrong according to me.

7

Aditya Vishwakarma answered this

Hope this helps you.

-10

Annachi answered this

All the answers are wrong
Check oswaal guide pg279 Q10

2

Shivam Kumar Jha answered this

Answer is 96.25 cm^2 (or 96 1/4 cm^2), verified from Official CBSE Marking Scheme, so rest assured there is no chance of mistake. Also, this question came in 2015 in Delhi Set 1.