Let's do this question if the radius of a cylinder is tripled, but it's called surface area is unchanged,
then its height will be alright.
So the radius is made three times the initial radius.
Now you need to find the change in the height was the video.
Give it a try and then let's do it together.
All right.
We are back.
Let's do it together.
So I draw a rough sketch over here.
This is my cylinder now.
The cold surface area is the natural surface area.
Right.
And we have seen that that is equal to two parts, OK.
And over here, it's mentioned that the radius has become three times red.
So the new cold surface area would be to buy into three hours into its dash.
And over here, it's given that this and this is equal.
So let's equate it.
We get to periods is equal to buy into three are into it's right now to buy and to buy can be canceled
over here and R and R can be canceled.
So you get that each is equal to three X dash or each dash is equal to X by three.
That is the height will become one third of the initial height.