Advertisements
Advertisements
प्रश्न
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.
Advertisements
उत्तर
Given length of the shape - 7cm
But length -r +r
⇒ 2r -7 cm
⇒ r - `7/2` cm
⇒ r-3.5 cm
Also : h - r
Total S.A of shape - `2πrh + 2πr^2 - 2πr × r +2πr^2`
- `2πr^2 + 2πr^2`
- `4 πr^2`
- `4× 22/7 × (3.5)^2`
-154`cm^2`
APPEARS IN
संबंधित प्रश्न
Find the surface area of a sphere of radius 10.5 cm.
`["Assume "pi=22/7]`
Find the surface area of a sphere of diameter 21 cm.
`["Assume "pi=22/7]`
Find the radius of a sphere whose surface area is 154 cm2.
`["Assume "pi=22/7]`
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.
A solid cone of radius 5 cm and height 8 cm is melted and made into small spheres of radius 0.5 cm. Find the number of spheres formed.
Find the surface area of a sphere of radius 5.6 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.
Find the maximum volume of a cone that can be carved out of a solid hemisphere of radius r cm.
A solid is in the form of a cone standing on a hemi-sphere with both their radii being equal to 8 cm and the height of cone is equal to its radius. Find, in terms of π, the volume of the solid.
The diameter of a sphere is 6 cm. It is melted and drawn into a wire of diameter 0.2 cm. Find the length of the wire.
How many spherical bullets can be made out of a solid cube of lead whose edge measures 44 cm, each bullet being 4 cm in diameter?
If a solid sphere of radius 10 cm is moulded into 8 spherical solid balls of equal radius, then the surface area of each ball (in sq.cm) is
Find the surface area of a sphere, if its volume is 38808 cubic cm. `(π = 22/7)`
There is a ratio 1: 4 between the surface area of two spheres, find the ratio between their radius.
The radius of a sphere is 10 cm. If we increase the radius 5% then how many % will increase in volume?
The surface area of a solid metallic sphere is 616 cm2. It is melted and recast into smaller spheres of diameter 3.5 cm. How many such spheres can be obtained?
The radius of a sphere increases by 25%. Find the percentage increase in its surface area
