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A disc of radius r has a hole of radius r/2 cut-out as shown. The centro id of the remaining disc (shaded portion) at a radial distance from the centre ‘O’ is
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- r/2
- r/3
- r/6
- r/8
Correct Option: C
New area = πr2 - π(r/2)2
| = | 4 |
Distance from centre to new centro id
| x = | ||||
| 4 | ||||
| = | 6 |
| ∴ x = | (away from centre) | 6 |
