Advertisements
Advertisements
प्रश्न
A circus tent is cylindrical to a height of 4 m and conical above it. If its diameter is 105 m and its slant height is 40 m, the total area of canvas required is
पर्याय
1760 m2
2640 m2
3960 m2
7920 m2
उत्तर
7920 m2
Total area of the canvas required = (Curved surface area of the cylinder) + (Curved surface area of the cone)
= (2πrh + πrl)
`= (2xx22/7xx105/2xx4)+(22/7xx105xx40) ["d" = 105 "cm" r = 105/2 "cm"]`
`=(1320 + 6600) m2`
= 7920 m2
APPEARS IN
संबंधित प्रश्न
A rectangular sheet of paper 40 cm × 22 cm, is rolled to form a hollow cylinder of height 40 cm. The radius of the cylinder (in cm) is ______.
A solid metallic sphere of radius 5.6 cm is melted and solid cones each of radius 2.8 cm and height 3.2 cm are made. Find the number of such cones formed.
A right circular cylinder and a right circular cone have equal bases and equal heights. If their curved surfaces are in the ratio 8 : 5, determine the ratio of the radius of the base to the height of either of them.
An iron pole consisting of a cylindrical portion 110 cm high and of base diameter 12 cm is surmounted by a cone 9 cm high. Find the mass of the pole, given that 1 cm3 of iron has 8 gram mass approximately. (Use : π = 355/115)
Two right circular cylinders of equal volumes have their heights in the ratio 1 : 2. What is the ratio of their radii ?
A cylindrical vessel 32 cm high and 18 cm as the radius of the base, is filled with sand. This bucket is emptied on the ground and a conical heap of sand is formed. If the height of the conical heap is 24 cm, the radius of its base is
The volume of the greatest sphere that can be cut off from a cylindrical log of wood of base radius 1 cm and height 5 cm is
The volumes of two cubes are in the ratio 8 : 27. Find the ratio of their surface areas.
In a right circular cone, if the perpendicular height is 12 cm and the radius is 5 cm, then find its slant height.
The length, breadth and height of a cuboidal reservoir is 7 m, 6 m and 15 m respectively. 8400 L of water is pumped out from the reservoir. Find the fall in the water level in the reservoir.
