Relations between angles and sides - created from Mind Map

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use cosine law

Area expressed in terms of sides and angles

p=semiperimeter=(a+b+c)/2

Law of tangent

Law of sine

Median formula

Bisector formula

plug cosine into the half angle identity

COS (THETA/2)

we get for sine half angle:

we get for cosine half angle:

since p=(a+b+c)/2

and for tangent half angle:

tangent of half angle is also equal to:

a+b=2p-c

a+c=2p-b

Radii of circumscribed and inscribed circles in terms of sides and angles

SEMIPERIMETER=p

s=p

S=area

Properties of Triangles - Half Angles - Sin A/2, Cos A/2 and Tan A/2 etc., (Enclavar)