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Deepali makes a model of a cylindrical kaleidoscope for her science project. She uses a chart paper to make it. If the length of the kaleidoscope is 25 cm and radius 3-5 cm, the area of the paper she used, in square cm, is (taking π = 22/7)
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- 1100
- 550
- 500
- 450
- 1100
Correct Option: B
Required area = 2πrh
| = 2 × | × 3.5 × 25 = 550 sq.cm. | |
| 7 |
