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# trigonometry used in mapmaking

Thu 6 Oct, 2011 09:37 am
in arriving at the forumla for "distance to a point by measuring 2 fixed angles " I get stuck about half way through the proof .Can you go through it in easy steps please.
David James
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fresco

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Thu 6 Oct, 2011 03:52 pm
@David James,
This seems to an application of the sine rule . If you know the distance apart of the two bearing positions A and B, then the distance of a third point point X can be found from the triangle ABX using
AB/sin AXB = AX/sin XBA

David James

1
Fri 7 Oct, 2011 07:07 am
@fresco,
Thank you fresco
I was struggling with d=l sin a sinb/ sin [a+b] .where a and b are the angles at
A and B. That came from Wicki. Triangulation and seems needlessly complex even if it works .
David James
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