Question

13) The diameter of the base of metallic cone is
2 cm and height is 10 cm. 900 such cones are
melted to form 1 right circular cylinder whose
radius is 10 cm. Find height of the right circular
cylinder so formed.
face area of a sphere​

Answer 1

Answer:

Height Of cylinder = 120cm

Explanation:

Since, the basic rule to solve this is

*VOLUME IS NEVER CHANGED*

--------------------------------------------------

area can be changes but Volume can never.

So,

since the volume of cone is :-

=> 1/3πr²h

=> 1/3 π 2² x10

=> 40/3π cm³ is the area of one cone.

So, area of 900 cones.

=> 12000πcm³

Now, equating this by

volm of cylinder.

πR²H= 12000π (AREA OF CYLINDER) ==>> πR²H

=> R²H=12000 (π cancelled)

=> Radius given is 10cm of cylinder.

=> 10²H=12000

=> H= 12000/100

=>H= 120cm.

also, check attachment!