Prove that for a cone made by rolling up...

Prove that for a cone made by rolling up a semicircle, the curved surface area is twice the base area.

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The central angle of a circle is divided in the ratio 2:3 to form two sectors. Two cones are made by rolling up the two sectors.Find out the ratio between the base perimeters of the cones.

What are the radius of the base and slant helght of a cone made by rolling up a sector of central angle 60^circ and of radius 10 centimetres cut out from a circle?

The central angle of a circle is divided in the ratio 2:3 to form two sectors. Two cones are made by rolling up the two sectors.What is the ratio between the curved surface areas.

Prove that the radius of the right circular cylinder of greatest curved surface area which can be inscribed in a given cone is half of that of the cone.

Radius and slant height of a solid right circular cone are 35cm and 37cm respectively,Find the curved surface area and total surface area of the cone.

The base area of a cone is 25pi cm, curved surface area 165pi . Calculate total surface area.

The base radius of a cone made by rolling up a sector is 3 centimetres. Its slant height is 15 centimetres.Calculate the area of this sector.

The base radius of a cone made by rolling up a sector is 3 centimetres. Its slant height is 15 centimetres.What is the radius of the sector used to make the cone?

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