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Similar triangles Proof

Amer

Active member
Mar 1, 2012
275
I was wondering why similar triangles have the property that the ratios of the similar sides are equal.
Or why the triangular functions (sin, cos,...) for a certain angle is fixed.
They are related, and if I can find one of them, the other can be proved easily.
I was thinking about the slope of the straight line since it is fixed and it is equal to the tan(angle which the line made with the positive x-axis) .

Any ideas?

Thanks.
 
Last edited by a moderator:

Zashmar

New member
Feb 24, 2013
5
.... You can just prove buy saying that angle AB,for example, is equal to AB2
 

Sudharaka

Well-known member
MHB Math Helper
Feb 5, 2012
1,621