From Class IX, you are familiar with some of the solids like cuboid, cone, cylinder, and sphere. You have also learnt how to find their surface areas and volumes.
The area occupied by a object from outside is known as surface area. Whereas the space occupied by a object from inside is known as volume.
Shaalaa.com | Surface Area and Volume part 1 (Basic)
Some plastic balls of radius 1 cm were melted and cast into a tube. The thickness, length and outer radius of the tube were 2 cm , 90 cm and 30 cm respectively. How many balls were melted to make the tube?
A metal parallelopiped of measures 16 cm x 11 cm x 10 cm was melted to make coins. How many coins were made if the thickness and diameter of each coin was 2 mm and 2 cm respectively ?
The diameter and length of a roller is 120 cm and 84 cm respectively. To level the ground, 200 rotations of the roller are required. Find the expenditure to level the ground at the rate of Rs. 10 per sq.m.