Trigonometric functions and triangles
Assume a triangle
with 3 vertex angles 
and 3 opposite sides 
. Let 
be the triangle's area;
the radius of the circumscribed circle; and 
.
Further, let
be the radius of the circumscribed circle; and 
the radii of the circles circumscribed outside the triangle's sides 
.
sine theorem
first cosine theorem
second cosine theorem
area
Hero's formula
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