Advertisements
Advertisements
प्रश्न
Find the surface area of a sphere of diameter 3.5 cm .
उत्तर
Diameter = 3.5cm
Radius - 3. 5cm/ 2 -1.75cm
∴Surface area - `4πr^2 - 4 × 22/7 × (3.5)/(2^2) - 38.5cm ^2`
APPEARS IN
संबंधित प्रश्न
Find the surface area of a sphere of diameter 21 cm.
`["Assume "pi=22/7]`
Find the surface area of a sphere of radius 10.5 cm .
Find the surface area of a sphere of radius 14 cm.
A hollow sphere of internal and external diameter 4 cm and 8 cm respectively is melted into a cone of base diameter 8 cm. Find the height of the cone.
Spherical marbles of diameter 1.4 cm are dropped into beaker containing some water and are fully submerged. The diameter of the beaker is 7 cm. Find how many marbles have been dropped in it if the water rises by 5.6 cm.
Find the volume of a sphere whose surface area is 154 cm2.
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 .
A certain number of metallic cones, each of radius 2 cm and height 3 cm are melted and recast into a solid sphere of radius 6 cm. Find the number of cones used.
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 hemispherical balloon increases from 6 cm to 12 cm as air is being pumped into it. The ratios of the surface areas of the balloon in the two cases is ______.
