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What else can I help you with?
Is it true that through any three points there exist exactly one point?
This is called 'trangulation'. It is used on the TV police dramas to find the location of the bad guy. well, not a straight line. because what if you had something looking like this: A . C . B .
How do you use triangulation?
Answer #1:Shooting two azimuths from different locations to find out where a targetobject is by where the lines cross on a map. Alternatively, shooting azimuthsto two different objects to find out where YOU are.==============================================Answer #1.5 :You are standing on one riverbank. There is a tree on the other riverbank.You want to know the width of the river. People have tried stretching atape measure across it. None of them was ever seen again. You have tocome up with a better way to measure it. You will triangulate it.-- Stand somewhere roughly opposite the tree. It doesn't have to be perfect.Jam a bright red stick into the ground between your feet.-- From there, with your tape measure, walk along the riverbank, mark exactly100-ft from where you started, and set up your tripod there. Look throughyour spotting scope and find the red stick in the ground on your side of theriver. Then measure the angle you have to turn the scope in order to spot thetree on the other riverbank. Write down the angle in your notebook.-- Go back to the red stick. Walk along the riverbank in the opposite direction,mark exactly 100-ft that way, and set up your tripod there. Look through thescope again and find the red stick in the ground on your side of the river. Thenmeasure the angle you have to turn the scope in order to spot the tree on theother riverbank. Write that one down in your notebook too.-- You have laid out a triangle. The three points that make the triangle are thetree and the two points 100-ft in each direction from the red stick.-- On your side of the river, you know the length of the triangle's 'base' ... it's 200 feet ...and you know the angle of the triangle at each end of the base.-- With that information and just a tiny bit of trigonometry, you can calculate thewidth of the river at the place where the tree is ... it's the height (altitude) of thetriangle. You can do all the calculating indoors, with a pencil and paper, and it'sas accurate as your measurements of the 100-ft lengths and the two angles were.
