Question

13. The radius of a solid right circular cylinder
decreases by 20% and its height increases by
10%. Find the percentage change in its
volume m) curved surface area
can you send full answer ​

Answer 1

Answer:

12%

Step-by-step explanation:

Let the radius of cylinder be r and height be h.

. °. Curved surface of cylinder =2¶rh

When radius decreases by 20%then,

New R=r-20%(r)=r-0.2r=0.8r

And, When height increases by 10%,then

New H =h+10/(h)=h+0.1h=1.1h

Now, new curved surface area =¶(0.8r)1.1h=1.76rh

change=2¶rh-1.76¶rh=0.24¶rh

%change= 0.24¶rh /2¶rh*100

=12%