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A cone of height 7 cm and base radius 1 cm is carved from a cuboidal block of wood 10 cm × 5cm × 2 cm. [Assuming π = 22/7] The percentage wood wasted in the process is :
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92 2 % 3
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46 1 % 3 -
53 2 % 3 -
7 1 % 3
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Correct Option: A
| Volume of cone = | πr²h = | × | × 1 × 7 = | cu.cm. | ||||
| 3 | 3 | 7 | 3 |
Volume of cubical block = 10 × 5 × 2 cm³. = 100 cm³.
| Wastage of wood = |  | 100 - |  | cm³ = | = | cm³ | |||
| 3 | 3 | 3 |
´
| ∴ % Wastage = | × 100 | |
| 100 | ||
| = | = 92 | % | ||
| 3 | 3 |
