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| 1. |
From two points on the ground lying on a straight line through the foot of a pillar, the two angles of elevation of the top of the pillar are complementary to each other. If the distance of the two points from the foot of the pillar are 9 meters and 16 meters and the two points lie on the same side of the pillar. Then the height of the pillar is |
| A. | 5 m |
| B. | 10 m |
| C. | 9 m |
| D. | 12 m |
| Answer» E. | |