Advertisements
Advertisements
प्रश्न
Find the surface area and volume of sphere of the following radius. (π = 3.14 )
9 cm
उत्तर
Radius of the sphere, r = 9 cm
Surface area of the sphere = 4πr2
= 4 × 3.14 × (9 cm)2
= 1017.36 cm2
Volume of the sphere = `4/3`πr3
= `4/3` x 3.14 x (9 cm)3
= 3052.08 cm3
APPEARS IN
संबंधित प्रश्न
Find the surface area of a sphere of diameter 21 cm.
`["Assume "pi=22/7]`
A solid sphere of radius 15 cm is melted and recast into solid right circular cones of radius 2.5 cm and height 8 cm. Calculate the number of cones recast.
A cylinder of same height and radius is placed on the top of a hemisphere. Find the curved
surface area of the shape if the length of the shape be 7 cm.
A spherical ball of lead has been melted and made into identical smaller balls with radius equal to half the radius of the original one. How many such balls can be made?
Eight metallic spheres; each of radius 2 mm, are melted and cast into a single sphere. Calculate the radius of the new sphere.
The volume of one sphere is 27 times that of another sphere. Calculate the ratio of their :
- radii,
- surface areas.
Find the total surface area of a hemisphere of radius 10 cm.
A sphere cut out from a side of 7 cm cubes. Find the volume of this sphere?
The radius of a sphere is 10 cm. If we increase the radius 5% then how many % will increase in volume?
The radius of a sphere increases by 25%. Find the percentage increase in its surface area
