Question

a metal cylindrical disc of base radius 28cm and height 7cm is melted and recast into a cylindrical block of base radius 14cm. find the length of the cylindrical block.also find the ratio of the total surface area of the cylindrical disc to that of the block.​

Answer 1

Answer

28 cm.

Step-by-step explanation:

π(7²)h= π(14²)7

h = 28 cm.

Concept :-

Frist we have to put the equations and then step by step slove the question .

The square should be put correctly if any mistakes happen in putting square and equation your mistakes will happen and it will be wrong .

So always see the equations properly and slove the question .

As I have done .

Answer 2

Answer:

28

Step-by-step explanation: