Question

Find the volume of the metal used in making the pipe.
4. Two cylindrical cans have the same bases of diameter 21 cm. If one of them is 12 cm high and the other
is 18 cm high then find the ratio of their volumes.
If the radius of the base of a right circular cylinder is halved, keeping the height the same, then find the​

Answer 1

Answer:

Ratio of their volume = 2:3

Volume = 1039.5cm^3 & 1559.25cm^3.

Step-by-step explanation:

Radius = d/2

21/2 cm.

H1 = 12cm

H2 = 18cm

Volume1= pi*r^2*h

Volume1 = 21*6*3*11.

Volume2 = pi*r^2*h

Volume 2 = 21*3*9*11.

ratio of their volume = 2:3

Now,

if the radius of circle is halved then,

Volume1 = pi*(21/4)^2*12

Volume1 = 1039.5.

Volume2 = pi*(21/4)^2*18

Volume2 = 1559.25.