SOLUTION: Why do we use only right angeled triangles in trignometry?

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Question 1042523: Why do we use only right angeled triangles in trignometry?
Found 2 solutions by stanbon, Edwin McCravy:
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
Why do we use only right angeles triangles in trignometry?
----
Right triangles is just the beginning.
They make it possible to survey our world.
But trigonometry goes way beyond right
triangles ; it enables us to understand
all the waves that cover the the earth,
surround the earth, and reach to the stars.
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Learn the right triangle trig--- it's just
the beginning.
Cheers,
Stan H.
-----------------

Answer by Edwin McCravy(20055) About Me  (Show Source):
You can put this solution on YOUR website!
Stanbon is right that the triangle is the basis for so many structures.
Go where they are building a building.  How many triangles do you see?

Maybe the answer to your question is that if we understand the
right triangle, then we understand all triangles because every 
triangle can be split into two right triangles, by drawing a line 
segment from one of the vertices to the opposite side.  For instance, 
take this triangle, which is not a right triangle at all.



But look what happens if we draw a perpendicular from
the top vertex to the bottom side:



We have split it into two right triangles:



Edwin