Advertisements
Advertisements
प्रश्न
Find the surface area of a sphere of diameter 14 cm.
`["Assume "pi=22/7]`
Advertisements
उत्तर
Radius (r) of sphere = `"Diameter"/2`
= `(14/2) cm`
= 7 cm.
Surface area of sphere = 4πr2
= `[4xx22/7xx(7)^2]cm^2`
= (88 × 7) cm2
= 616 cm2
Therefore, the surface area of a sphere having diameter 14 cm is 616 cm2.
APPEARS IN
संबंधित प्रश्न
On a map drawn to a scale of 1: 50,000, a rectangular plot of land ABCD has the following dimensions. AB = 6 cm; BC = 8 cm and all angles are right angles. Find:
1) the actual length of the diagonal distance AC of the plot in km.
2) the actual area of the plot in sq. km.
Two solid spheres of radii 2 cm and 4 cm are melted and recast into a cone of height 8 cm. Find the radius of the cone so formed.
Find the surface area of a sphere of diameter 3.5 cm.
A hemi-spherical dome of a building needs to be painted. If the circumference of the base of
the dome is 17.6 cm, find the cost of painting it, given the cost of painting is Rs. 5 per l00
`cm^2`
The volume of one sphere is 27 times that of another sphere. Calculate the ratio of their :
- radii,
- surface areas.
Metallic spheres of radii 6 cm, 8 cm and 10 cm respectively are melted and recasted into a single solid sphere. Taking π = 3.1, find the surface area of the solid sphere formed.
If a sphere is inscribed in a cube, find the ratio of the volume of cube to the volume of the sphere.
The total surface area of a hemisphere of radius r is
A sphere and a cube are of the same height. The ratio of their volumes is
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 surface area of a sphere is 144π m2, then its volume (in m3) is
A cone, a hemisphere and a cylinder stand on equal bases and have the same height. The ratio of their volumes is
If the surface area of a sphere is 2826 cm2 then find its volume. ( π= 3.14)
Find the surface area of a sphere, if its volume is 38808 cubic cm. `(π = 22/7)`
The radius of a sphere is 9 cm. It is melted and drawn into a wire of diameter 2 mm. Find the length of the wire in metre.
How many lead balls of radii 1 cm each can be made from a sphere of 8 cm radius?
Find the volume of the hollow sphere whose inner diameter is 8 cm and the thickness of the material of which it is made is 1 cm .
The internal and external diameters of a hollow hemi-spherical vessel are 21 cm and 28 cm respectively. Find volume of material of 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
