SOLUTION: Two poles, 30 feet and 50 feet tall, are 40 feet apart and perpendicular to the ground. The poles are supported by wires attached from the top of each pole to the bottom of the oth
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Question 273868: Two poles, 30 feet and 50 feet tall, are 40 feet apart and perpendicular to the ground. The poles are supported by wires attached from the top of each pole to the bottom of the other, as in the figure. A coupling is placed at C where the tow wires cross.
Find x, the distance from C to the taller pole?
How high above the ground is the coupling?
How far down the wire from the smaller pole is the coupling?
Found 2 solutions by scott8148, noelsanoj:
Answer by scott8148(6628) (Show Source): You can put this solution on YOUR website!
picture the taller pole standing at the origin and running up the y-axis
the shorter pole is standing 40 ft out on the x-axis
the equation of the wire from the top of the taller pole to the bottom of the shorter pole is ___ y = (-5/4)x + 50
the equation of the other wire is ___ y = (3/4)x
substituting ___ (3/4)x = (-5/4)x + 50 ___ x = 25
substituting ___ y = (3/4)25 = 75/4 = 18.75
C is 18.75 ft off the ground and 25 ft from the taller pole
leaving the third part for you to find
*BIG HINT* ___ 3 - 4 - 5 TRIANGLE
Answer by noelsanoj(1) (Show Source): You can put this solution on YOUR website!
Let A be the distance from the ground to the coupling C (perpendicular to the ground and parallel to both poles)
Let D be the distance from the tallest poll to the point on the ground from C.
(Angle-Angle (AA) Similarity) two pair of similar triangles are formed.
Using proportions on the smaller pair of triangles to find the distance on the ground from under C to the largest pole.
30d = 40a
for the larger pair of triangles
50(40-d) = 40a
Notice 40a, substituting on both equations
30d)=50(40-d)
30a = 2000-50d
80d = 2000
d = 25 feet. If you subtract from 40 you get the other base which is 15ft.
Substitute to find the height of the coupling
30d = 40a
30(25)=40a
a=750/40
a=18.75 feet height.
How far down the wire from the smaller pole is the coupling?
Notice that the smaller pole formed a dilation by a factor 10 from a 3,4,5 triangle. Therefore, the wire from the smaller pole to the base of the larger is 50ft. Then using the Triangle Proportionality Theorem, formulate the following proportion.
Let y be the distance of the segment from the pole to C (Coupling) use the proportion.
y=18.75 feet
For the distance from C to the Taller pole, using Pythagoras
the hypotenuse is about 64 feet round to the unit.
To find the distance from C to the taller pole, again use the Triangle Proportionality Theorem..
Let p be the distance from C to the Taller pole.
The distance is 40 feet.
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