Advertisements
Advertisements
Question
The area of the curved surface of a cone of radius 2r and slant height `1/2`, is
Options
`pirl`
`2pirl`
`1/2pirl`
`pi (r+l)r`
Solution
The formula of the curved surface area of a cone with base radius ‘r’ and slant height ‘l’ is given as
Curved Surface Area = πrl
Here the base radius is given as ‘2r’ and the slant height is given as ‘`l/2`’
Substituting these values in the above equation we have
Curved Surface Area = `((pi)(2)(r)(l))/2`
= πrl
APPEARS IN
RELATED QUESTIONS
Find the volume of the right circular cone with radius 3.5 cm and height 12 cm.
`["Assume "pi=22/7]`
Find the capacity in litres of a conical vessel with height 12 cm and slant height 13 cm.
`["Assume "pi=22/7]`
If the volume of a right circular cone of height 9 cm is 48π cm3, find the diameter of its base.
If the volume of a right circular cone of height 9 cm is 48 `pi` cm3, find the diameter of its base.
If the volume of two cones are in the ratio 1 : 4 and their diameters are in the ratio 4 : 5, then the ratio of their heights, is
A right circular cylinder and a right circular cone have the same radius and the same volume. The ratio of the height of the cylinder to that of the cone is
The height of a solid cone is 12 cm and the area of the circular base is 64 `pi`cm2. A plane parallel to the base of the cone cuts through the cone 9 cm above the vertex of the cone, the areas of the base of the new cone so formed is
If the base radius and the height of a right circular cone are increased by 20%, then the percentage increase in volume is approximately
Find the volume of a cone, if its total surface area is 7128 sq. cm and radius of base is 28 cm. `(π = 22/7)`
There are 25 persons in a tent which is conical in shape. Every person needs an area of 4 sq.m. of the ground inside the tent. If height of the tent is 18 m, find the volume of the tent.
