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USER’S GUIDE — 105
Law of Cosines
Law of Sines
Heron’s Theorem
Tan =
A
2
r
s – a
()
Tan =
B
2
r
s – b
()
Tan =
C
2
r
s – c
()
s = (a + b + c)
1
2
A
CaB
c
b
a
=
b
=
c
= 2R
sin A sin B sin C
R
A
BaC
b
c
a
2
= b
2
+ c
2
– 2bccosA
b
2
= c
2
+ a
2
– 2cacosB
c
2
= a
2
+ b
2
– 2abcosC
APPENDIX D — LAW OF COSINES / HERON’S
THEOREM FORMULAS
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