Mathematics
The given figure shows a solid cylinder and a solid cone on it according to the given measurement, the total surface area of the solid in terms of π and r is :
4πr2
5πr2
6πr2
7πr2
Related Questions
A cone and a sphere have equal volumes. If height of the cone = radius of the sphere = 10 cm, the radius of the cone is :
40 cm
10 cm
30 cm
20 cm
A solid metal cuboid with dimensions 11 cm, 18 cm and 8 cm is melted and identical solid spheres, each of radius 1 cm, are formed. The number of spheres formed is :
378
1134
1512
none of these
By applying force on an uniform metallic wire, the wire is extended four times along its length with same width all around. Then :
(i) The volume of metal in both the cases is same.
(ii) The surface area of solid wires in both the cases is same.
Which of the above statements is/are true?
only (i)
only (ii)
both (i) and (ii)
neither (i) nor (ii)
The radii of two solid spheres are 10 cm and 20 cm. The ratio between their volumes is :
3 : 8
1 : 4
1 : 8
8 : 3