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# Trigonometry

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The angle of elevation from Tammy to the helicopter is 12Â°. Tammy and Rusty are 700 meters apart. If Tammy is 400 meters from the helicopter, find the distance from Rusty to the helicopter. Round the answer to the nearest whole meter.

Guest Mar 23, 2017
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First calculate the horizontal distance from Tammy to the helicopter.

$$\cos 12 = \dfrac{\text{Horizontal distance}}{400}\\ \text{Horizontal distance} =400 \cos 12$$

Add 700 to the result to obtain the horizontal distance from Rusty to the helicopter.

Horizontal distance from Rusty to the helicopter = 400 cos 12 + 700 = 1091.3 meters :)

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MaxWong  Mar 23, 2017