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| 1. |
Two walls and a ceiling of a room meet at right angles at a point P. A fly is in the air 1 m from one wall, 8 m from the other wall and 9 m from the point P. How many meters is the fly away from the ceiling? |
| A. | 4 |
| B. | 6 |
| C. | 12 |
| D. | 15 |
| Answer» B. 6 | |