| A pole 5 m high is fixed on the top of a tower. The angle of elevation of | |
| the top of the pole observed from a point 'A' on the ground is 60o and the | |
| angle of the depression of the point "A" from the top of the tower is 45o. | |
| Find the height of the tower. | |
| Strategy - the rule "Must have" of Mr.Zhang ® |
| Solution |
| Compute the time to the height of tower by; |
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