Application of Derivatives 4 Question 31
33. A rectangular sheet of fixed perimeter with sides having their lengths in the ratio
(2013 Adv.)
(a) 24
(b) 32
(c) 45
(d) 60
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Answer:
Correct Answer: 33. (b, c)
Solution:
- PLAN
The problem is based on the concept to maximise volume of cuboid, i.e. to form a function of volume, say
Here,
On differntiating Eq. (i) w.r.t
Again, differentiating,
| {f170454459647787899} |
|
|---|---|
 |
|
Here,
At
At
Thus, sides are
