CBSE Class 8 - Surface Area and Volume of Cylinder Videos

• what will be it's cost to paint the circular roof of a building of radius 4.2 m at the rate of Rs. 25squar meter?
• The ratio of the radii of two cylinders is 1:2, and the ratio of their heights is 2:3, find the ratio of the volumes of the two cylinders.
• what is the formula of lateral surface area of cylinder
• sphere is converted into a cylindrical wire of length 32 metre. The diameter of sphere is 20 times of the diameter of the cylindrical wire. What is the radius of sphere?
• Find the total surface area of a cylinder whose radius of the base =7cm and height=20cm
• A metallic pipe is 0.7 cm thick. Inner radius id 3.5 cm and length is 5 dm. Find its total surface area.  
• A silver paper covers a packet of 10 choclates Coin of radiud 2cm and 7mm thickness.  How much paper need to cover 1000 such packets. 
• The wall of length 10 m. was to built across an open ground .the height of wall is 4m. And thickness is 24 cm . If this wall is to built uo with bricks whose dimension are 24cm×12cm×8cm, how many bricks would be required ?        Ans - 4167 
• Find the radius of the base of a cylinder whose volume and height are 1.54 cm³ and 1 m respectively.
• A 20 m deep well with diameter 7 m is dug and the earth from digging is evenly spread out to form a platform 22 m by 14 m. Find the height of the platform.

Queries asked on Sunday & after 7 pm from Monday to Saturday will be answered after 12 pm the next working day.