Mathematics
A solid sphere and a solid hemi-sphere have the same total surface area. Find the ratio between their volumes.
Related Questions
The internal and external diameters of a hollow hemispherical vessel are 21 cm and 28 cm respectively. Find :
(i) internal curved surface area,
(ii) external curved surface area,
(iii) total surface area,
(iv) volume of material of the vessel.
Metallic spheres of radii 6 cm, 8 cm and 10 cm respectively are melted and recasted into a single solid sphere. Taking π = 3.1, find the surface area of the solid sphere formed.
A cone and a sphere have equal volumes. Their radii are also equal each being 10 cm; the height of the cone is :
70 cm
40 cm
50 cm
20 cm