Asked by Emily J
A 20 m vertical telephone pole is standing on a 15 degree slope. One guy wire is attached 30 m up the slope and another guy wire is attached 30 m down the slope. What is the length of the guy wire attached down the slope?
I don't understand the question or what the diagram should look like.
I don't understand the question or what the diagram should look like.
Answers
Answered by
Steve
well, shoot. Look from the side.
Draw a sloping line representing the ground.
Place a vertical line on the slope somewhere. Label the top T and the bottom B. That is the pole. Label its length 20.
Mark two points on the slope, equal distances from the pole. Label those distances 30. Label the downhill mark D and the uphill mark U.
You want the distance TD.
The angle TBD is 90+15 = 105°
By the law of cosines, the distance TD is found from
TD^2 = 30^2 + 20^2 - 2*30*20 cos 105°
Draw a sloping line representing the ground.
Place a vertical line on the slope somewhere. Label the top T and the bottom B. That is the pole. Label its length 20.
Mark two points on the slope, equal distances from the pole. Label those distances 30. Label the downhill mark D and the uphill mark U.
You want the distance TD.
The angle TBD is 90+15 = 105°
By the law of cosines, the distance TD is found from
TD^2 = 30^2 + 20^2 - 2*30*20 cos 105°
Answered by
Anonymous
90
Answered by
greg
40.13
Answered by
L
40.1
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