Advertisements
Advertisements
प्रश्न
Find the surface area of a sphere of diameter 3.5 m.
`["Assume "pi=22/7]`
Advertisements
उत्तर
Radius (r) of sphere = `"Diameter"/2`
= `3.5/2`
= 1.75 m
Surface area of sphere = 4πr2
= `[4 xx 22/7 xx (1.75)^2] m^2`
= 38.5 m2
Therefore, the surface area of the sphere having diameter 3.5 m is 38.5 m2.
APPEARS IN
संबंधित प्रश्न
A model of a ship is made to a scale 1: 300
1) The length of the model of the ship is 2 m. Calculate the lengths of the ship.
2) The area of the deck ship is 180,000 m2. Calculate the area of the deck of the model.
3) The volume of the model in 6.5 m3. Calculate the volume of the ship.
Find the total surface area of a hemisphere and a solid hemisphere each of radius 10 cm.
(Use 𝜋 = 3.14)
A hemispherical bowl made of brass has inner diameter 10.5 cm. Find the cost of tin- plating
it on the inside at the rate of Rs. 4 per 100 `cm^2`
How many balls each of radius 1 cm can be made by melting a bigger ball whose diameter is 8 cm?
The volume of one sphere is 27 times that of another sphere. Calculate the ratio of their :
- radii,
- surface areas.
A hollow sphere of internal and external radii 6 cm and 8 cm respectively is melted and recast into small cones of base radius 2 cm and height 8 cm. Find the number of cones.
What is the least number of solid metallic spheres, each of 6 cm diameter, that should be melted and recast to form a solid metal cone whose height is 45 cm and diameter 12 cm?
Find the volume of a sphere whose surface area is 154 cm2.
The ratio of the total surface area of a sphere and a hemisphere of same radius is
The largest sphere is cut off from a cube of side 6 cm. The volume of the sphere will be
A cylindrical rod whose height is 8 times of its radius is melted and recast into spherical balls of same radius. The number of balls will be
If the ratio of volumes of two spheres is 1 : 8, then the ratio of their surface areas is
If a sphere is inscribed in a cube, then the ratio of the volume of the sphere to the volume of the cube is
A cone, a hemisphere and a cylinder stand on equal bases and have the same height. The ratio of their volumes is
Find the length of the wire of diameter 4 m that can be drawn from a solid sphere of radius 9 m.
How many lead balls of radii 1 cm each can be made from a sphere of 8 cm radius?
Find the volume and surface area of a sphere of diameter 21 cm.
There is surface area and volume of a sphere equal, find the radius of sphere.
A vessel is in he form of an inverted cone. Its height is 11 cm., and the radius of its top which is open is 2.5 cm. It is filled with water up to the rim. When lead shots, each of which is a sphere of radius 0.25 cm., are dropped 2 into the vessel, `2/5`th of the water flows out. Find the number of lead shots dropped into the vessel.
The internal and external diameters of a hollow hemispherical vessel are 20 cm and 28 cm respectively. Find the cost to paint the vessel all over at ₹ 0.14 per cm2
