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Old 04-26-2008, 10:35 PM   #1
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Default Finding the correct angle?

Rep to whoever can solve this and help me out. Edit: I've got the answer now but I guess I'll leave it unsolved for now to see if anyone can solve it here.

Point A 1802 Feet
Point B 2170 Feet

Distance 5.21 Miles

I need to aim my antenna from point A at the top of point B at 2170 Feet. What specific angle would this be? The antenna is currently pointed horizontal with the ground.

Assuming the ground is 180 degrees I'm currently at 90 degrees what degree lines up with 2170 Feet?
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Old 04-26-2008, 10:51 PM   #2
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Default Re: Finding the correct angle?

/Brain explodes
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Old 04-26-2008, 11:14 PM   #3
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Default Re: Finding the correct angle?

I got bored, so tried. That's a hard one. You gotta know like trig or something to get it I think. I at least found you can find the right triangle and use the Pythagorean Theorem to find the hypotenuse (distance from point A to top of point B).

Distance in feet at 5.21 miles is 275808.8ft.

Distance from point A to top of point B is 27511.263567608ft

The other distance is 368ft, though it shouldn't be important.

Kinda hard to draw a triangle in text, so I hope you get it... From there you can find the angle somehow, I tried several different approaches and had no idea what I was doing...lol.
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Old 04-26-2008, 11:18 PM   #4
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Default Re: Finding the correct angle?

Quote:
Originally Posted by Jesusfrk611 View Post
I got bored, so tried. That's a hard one. You gotta know like trig or something to get it I think. I at least found you can find the right triangle and use the Pythagorean Theorem to find the hypotenuse (distance from point A to top of point B).

Distance in feet at 5.21 miles is 275808.8ft.

Distance from point A to top of point B is 27511.263567608ft

The other distance is 368ft, though it shouldn't be important.

Kinda hard to draw a triangle in text, so I hope you get it... From there you can find the angle somehow, I tried several different approaches and had no idea what I was doing...lol.
I'll hit you up with some rep for trying I've got the answer now but I won't put it up just yet. I want to see if anyone can answer it.
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Old 04-26-2008, 11:24 PM   #5
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Default Re: Finding the correct angle?

SOACAHTOA!!!! lol, but I dont want to calculate it right now... Maybe in the morning...
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Old 04-27-2008, 05:29 PM   #6
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Default Re: Finding the correct angle?

I hope I'm on the right track with this!!

2170-1802 = 368

368/27511 (opp/adj) = 0.01........ etc
Inverse tan 0.01 = 0.5 degrees
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Old 04-27-2008, 05:34 PM   #7
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Default Re: Finding the correct angle?

Thanks and you were pretty close! Here is the full formula.

Imagine points A and B onto a graph, with the coordinates of A (x,y) be (0,1802). The x-coordinate for point B will be the 27508.8 we got, and the y will be 2170, so the coordinate will be (27508.8, 2170).

Now since I can make an imaginary right triangle, the angle x is just the inverse tangent of the y difference divided by the x difference.

x = atan (2170-1802)/(27508.8)

x = .766430713988... (degree)

which rounds to

x = .766 degree
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Old 04-27-2008, 05:39 PM   #8
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Default Re: Finding the correct angle?

Atleast I was close. I forgot to put 368/27511 in brackets!!
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