Advertisements
Advertisements
प्रश्न
Find the volume and surface area of a sphere of diameter 21 cm.
Advertisements
उत्तर
Diameter of sphere = 21 cm
∴ Radius of sphere = `21/2` cm
∴ Surface area of sphere = 4πr2
= `4 xx 22/7 xx 21/2 xx 21/2`
= 1386 cm2
Volume of sphere = `4/3`πr3
= `4 xx 22/7 xx 21/2 xx 21/2 xx 21/2`
= 4851 cm3.
संबंधित प्रश्न
Find the surface area of a sphere of diameter 3.5 m.
`["Assume "pi=22/7]`
The surface area of a solid metallic sphere is 2464 cm2. It is melted and recast into solid right circular cones of radius 3.5 cm and height 7 cm. Calculate:
- the radius of the sphere.
- the number of cones recast. (Take π = `22/7`)
The surface area of a sphere is 5544 `cm^2`, find its diameter.
Find the volume of a sphere whose surface area is 154 cm2.
The surface area of a sphere of radius 5 cm is five times the area of the curved surface of a cone of radius 4 cm. Find the height of the cone.
If the radius of a solid hemisphere is 5 cm, then find its curved surface area and total surface area. ( π = 3.14 )
From a rectangular solid of metal 42 cm by 30 cm by 20 cm, a conical cavity of diameter 14 cm and depth 24 cm is drilled out. Find: the volume of remaining solid
A conical tent is to accommodate 77 persons. Each person must have 16 m3 of air to breathe. Given the radius of the tent as 7 m, find the height of the tent and also its curved surface area.
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?
