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law of sin and cos
concept quiz
Question | Answer |
---|---|
Law of Sines | a/SinA=b/SinB=c/SinC |
Ambiguous Case | for SSA |
Two | h<a<b |
none | a<h or a<=b |
area of oblique triangle | 1/2bcSinA or 1/2abSinC or 1/2acSinB |
when to use sin or cos | AAS ASA SSA (sin) SSS SAS |
oblique triangles | triangles have no right angle |
a2 | b2+c2-2bcCosA |
b2 | a2+c2-2acCosB |
c2 | a2+b2-2abCosC |
Cos A | b2+c2-a2/2bc |
CosB | a2+c2-b2/2ac |
Cos C | a2+b2-c2/2ab |
Herons Area Formula | square root of s(s-a)(s-b)(s-c) |
s equals | (a+b+c)/2 |