Q1 of 35 Page 201

What is the area of the curved surface of a cone of base radius 12 centimetres and slant height 25 centimetres?

Given: base radius rb = 12cm

Slant height l = 25cm


We know that, Curved surface area of cone = πrbl


Where rb = base radius and l = slant height


Curved surface area of cone = π× 25× 12 = 300π cm2


More from this chapter

All 35 →
2

What is the central angle of the sector to be used to make a cone of base radius 10 centimetres and slant height 25 centimetres?

 3

What is the ratio of the base – radius and slant height of a cone made by rolling up a semicircle?

 2

What is the surface area of a cone of base diameter 30 centimetres and height 40 centimetres?

 3

A conical fire work is of base diameter 10 centimetres and height 12 centimetres. 10000 such fireworks are to be wrapped in colour paper. The price of the colour paper is 2 rupees per square metre. What is the total cost?