Problem 8 of 34geo-008
A zip line cable runs in a straight line from the top of a vertical tower to an anchor on level ground. The anchor is meters from the base of the tower, and the cable makes a angle with the ground. Given that , , and , about how many meters long is the cable?
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Solution walkthrough1:45
- Draw it. The tower, the ground and the cable form a right triangle with a angle at the anchor.
- From the angle, the m side is adjacent and the cable is the hypotenuse. That pair means cosine.
- Fill in what we know: , and the problem says .
- Multiply both sides by : . Divide by : meters.
- multiplies by . uses tangent, . uses sine, .