need help: Greg and Kristine are on opposite ends of a zip line that crosses a gorge.

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daveyc3000

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"Greg and Kristine are on opposite ends of a zip line that crosses a gorge. Greg went across the gorge first, and he's now on a ledge that's 15 m above the bottom of the gorge. Kristen is at the top of a cliff that is 72 m above the bottom of the gorge. Jon is on the ground at the bottom of the gorge, below the zip line. He sees Kristen at a 65 degree angle of elevation and Greg at a 35 degree angle of elevation,. What is the width of the gorge to the nearest metre?"

Answer: 55 m.
 
daveyc3000 said:
"Greg and Kristine are on opposite ends of a zip line that crosses a gorge. Greg went across the gorge first, and he's now on a ledge that's 15 m above the bottom of the gorge. Kristen is at the top of a cliff that is 72 m above the bottom of the gorge. Jon is on the ground at the bottom of the gorge, below the zip line. He sees Kristen at a 65 degree angle of elevation and Greg at a 35 degree angle of elevation,. What is the width of the gorge to the nearest metre?"

Answer: 55 m.
Click to expand...

It might be good to draw a picture and show us some of your best trigonometry. The difficulty is in deciding where, exactly, Jon is. You might want to put him in the middle of the gorge - unless there's a river and he can't swim.
 
daveyc3000 said:
"Greg and Kristine are on opposite ends of a zip line that crosses a gorge. Greg went across the gorge first, and he's now on a ledge that's 15 m above the bottom of the gorge. Kristen is at the top of a cliff that is 72 m above the bottom of the gorge. Jon is on the ground at the bottom of the gorge, below the zip line. He sees Kristen at a 65 degree angle of elevation and Greg at a 35 degree angle of elevation,. What is the width of the gorge to the nearest metre?"

Answer: 55 m.
Click to expand...

After you draw the picture, you should see that you need to find the horizontal distance from Jon to each of the others, and add these. What trig function will be appropriate?
 
tkhunny said:
It might be good to draw a picture and show us some of your best trigonometry. The difficulty is in deciding where, exactly, Jon is. You might want to put him in the middle of the gorge - unless there's a river and he can't swim.
Click to expand...

Ya the question doesn't state where he is precisely.
 
daveyc3000 said:
Ya the question doesn't state where he is precisely.
Click to expand...

I think it's reasonably clear that he's at the bottom of the gorge, between the two others, who are respectively 15 and 72 meters higher. That's all you need to know. (The rest is for you to figure out from the given data.)

What have you tried so far? You haven't shown any work, so we can't help much. (Did you read our guidelines?)
 
Dr.Peterson said:
I think it's reasonably clear that he's at the bottom of the gorge, between the two others, who are respectively 15 and 72 meters higher. That's all you need to know. (The rest is for you to figure out from the given data.)

What have you tried so far? You haven't shown any work, so we can't help much. (Did you read our guidelines?)
Click to expand...

I'll upload the work shortly
 
Dr.Peterson said:
I think it's reasonably clear that he's at the bottom of the gorge, between the two others, who are respectively 15 and 72 meters higher. That's all you need to know. (The rest is for you to figure out from the given data.)

What have you tried so far? You haven't shown any work, so we can't help much. (Did you read our guidelines?)
Click to expand...

ill upload what i have shortly.
 
Just for the record, I help out on MHF, MHB, MMF, and here. I noticed that you posted your problem on all of these fora after Dr. Peterson asked you to show what work you've done. It seems fair that if you can post the same question on all of these fora in order to see if someone is going to just give you the answer then I can respond with the same comment on each as well.
As Dr, Peterson asked you on FMH: "What have you tried so far?"
Click to expand...

-Dan
 
topsquark said:
Just for the record, I help out on MHF, MHB, MMF, and here. I noticed that you posted your problem on all of these fora after Dr. Peterson asked you to show what work you've done. It seems fair that if you can post the same question on all of these fora in order to see if someone is going to just give you the answer then I can respond with the same comment on each as well.


-Dan
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Thanks Dan. I was going to try to offer help but that will not happen now.
 
The OP posted at MHB (and other sites) that they had found the answer elsewhere, and no longer needed help. Since I admin at MHB, I wanted the thread to at least be useful to others viewing it in the future, so I gave the thread a useful title, and posted how to obtain the solution.

In hindsight, I should have waited a day or two before doing so, because now I feel I may have fallen for a trick. :p
 
MarkFL said:
The OP posted at MHB (and other sites) that they had found the answer elsewhere, and no longer needed help. Since I admin at MHB, I wanted the thread to at least be useful to others viewing it in the future, so I gave the thread a useful title, and posted how to obtain the solution.

In hindsight, I should have waited a day or two before doing so, because now I feel I may have fallen for a trick. :p
Click to expand...
It happens. At least we know if he tries to post in the future.

-Dan
 
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