Subject :IMO Class : Class 9
Evaluate the following :
(i) The sum of length, breadth and depth of a cuboid is 19 cm and the length
of its diagonal is 11 cm, then find the surface area of the cuboid.
(ii) If the radii of two circular cylinders are in the ratio 3 : 4, and their heights are in the ratio 6 : 5, then find the ratio of their curved surface areas.
| (i) | (ii) | |
|---|---|---|
| A | 180 cm2 | 9 : 11 |
| B | 240 cm2 | 9 : 10 |
| C | 120 cm2 | 8 : 5 |
| D | 321 cm2 | 7 : 10 |