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| 1. |
When sun's altitude changes from 30° to 60°, the length of the shadow of a tower decreases by 70 m. What is the height of the tower? |
| A. | 35 m |
| B. | 140 m |
| C. | 60.6 m |
| D. | 20.2 m |
| Answer» D. 20.2 m | |