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解三角形的关键是建模,但实际应用中,三角形题型多样、解法多样,不同的建模方式,就有不同的难易。例1.已知:如图一由C点看塔顶A的仰角为30°,向塔直走100米到达D点,再测得仰角为60°,求塔高AB。
The key to solve the triangle is modeling, but in practical applications, the variety of triangular questions, diverse solutions, different modeling methods, there are different difficult. Example 1. It is known that as shown in Figure 1, the elevation angle of tower top A is 30 ° from point C, 100 meters straight to the tower to reach point D, and the elevation angle is 60 °.