## Lecture 11 Application of Derivatives P9

We become what we think about most of the time, and that’s the strangest secret. – Earl Nightingale

# Part - 9 Lecture - 11 Chapter 6 Application of Derivatives

Topics discussed in this lecture:

In this lecture I am discussing word problems in chapter 6 Applications of derivatives based on Local Maxima and Local Minima.

 NCERT EXERCISE 6.5

Question discussed in this lecture

Question 20. Show that the right circular cylinder of given surface and maximum volume is such that its height is equal to the diameter of the base.

Question 21. Of all the closed cylindrical cans (right circular), of a given volume of 100 cubic centimetres, find the dimensions of the can which has the minimum surface area?

Question 22. A wire of length 28 m is to be cut into two pieces. One of the pieces is to be made into a square and the other into a circle. What should be the length of the two pieces so that the combined area of the square and the circle is minimum?