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Variable Legend
a,b,c= side lengthsA,B,C= angles opposite sides a, b, cs= semi-perimeter = (a+b+c)/2
Law of sines
Relates sides and their opposite angles.
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Law of cosines
Generalisation of Pythagorean theorem.
Find side c
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Find angle C
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Area (Heron's formula)
Area from three sides only.
s
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Area
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Area from base and height
Standard formula.
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Deep Dive
Read the full guide on how to use this calculator effectively
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