Advertisements
Advertisements
प्रश्न
The total surface area of a hemisphere of radius r is
पर्याय
- \[\pi r^2\]
2 \[\pi r^2\]
3 \[\pi r^2\]
4 \[\pi r^2\]
उत्तर
The curved surface area of a hemisphere of radius r is
2 \[\pi r^2\] So, the total surface area of a hemisphere will be the sum of the curved surface area and the area of the base.
Total surface area of a hemisphere of radius r =
2 \[\pi r^2\] + \[\pi r^2\]
=3 \[\pi r^2\]
APPEARS IN
संबंधित प्रश्न
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 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 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.
Find the surface area and volume of sphere of the following radius. (π = 3.14 )
9 cm
A solid metallic cylinder has a radius of 2 cm and is 45 cm tall. Find the number of metallic spheres of diameter 6 cm that can be made by recasting this cylinder .
Find the volume and surface area of a sphere of diameter 21 cm.
A spherical cannon ball, 28 cm in diameter is melted and recast into a right circular conical mould, the base of which is 35 cm in diameter. Find the height of the cone, correct to one place of decimal.
