Advertisements
Advertisements
प्रश्न
The curved surface area of a right circular cone of height 15 cm and base diameter 16 cm is
विकल्प
60π cm2
68π cm2
120π cm2
`136 pi cm^3`
उत्तर
Height,
`h = 15 cm,`
`r= 16/2`
`= 8 cm`
`l = sqrt(r^2 + h^2)`
`= sqrt(8^2 + 15^2)`
`= sqrt(64 + 225)`
`=sqrt289`
`l = 17 cm`
The C.S.A. of cone
`= pirl`
`=pi xx 8 xx 17`
`=136 pi cm^3`
APPEARS IN
संबंधित प्रश्न
A solid metallic sphere of radius 10.5 cm is melted and recast into a number of smaller cones, each of radius 3.5 cm and height 3 cm. Find the number of cones so formed.
A frustum of a cone is 9 cm thick and the diameters of its circular ends are 28 cm and 4 cm. Find the volume and lateral surface area of the frustum.
(Take π = 22/7).
An oil funnel of tin sheet consists of a cylindrical portion 10 cm long attached to a frustum of a cone. If the total height be 22 cm, the diameter of the cylindrical portion 8 cm and the diameter of the top of the funnel 18 cm, find the area of the tin required.(Use π = 22/7).
The material of a cone is converted into the shape of a cylinder of equal radius. If height of the cylinder is 5 cm, then height of the cone is
A cylinder with base radius of 8 cm and height of 2 cm is melted to form a cone of height 6 cm. The radius of the cone is
A metalic solid cone is melted to form a solid cylinder of equal radius. If the height of the cylinder is 6 cm, then the height of the cone was
A container in the shape of a frustum of a cone having diameters of its two circular faces as 35 cm and 30 cm and vertical height 14 cm,
is completely filled with oil. If each cm3 of oil has mass 1.2 g, then find the cost of oil in the container if it costs ₹40 per kg.
A cone is cut through a plane parallel to its base and then the cone that is formedon one side of that plane is removed. The new part that is left over on the other side of the plane is called ______.
In a right circular cone, the cross-section made by a plane parallel to the base is a ______.
Find the curved surface area of a right circular cone whose height is 15 cm and base radius is 8 cm. tan β = `3/4`.
