4. A communications tower is located at the top of a steep hill, as shown. A guy-wire is to be attached to the top of the tower and to the ground, 165 m downhill from the base of the tower. The height of the tower is 80 m, how long is the guy-wire? 163 5. The roof of a house is at a 20 angle. An 8 foot solar panel is to be mounted on the roof, and should be angled 38 relative to the horizontal for optimal results. How long does the vertical support holding up the back of the panel need to be? 3.20 8 ft 48 165m