6. Triangle Trigonometry Flashcards
1
Q
sinθ =
cosθ =
tanθ =
A
opp/hyp
adj/hyp
opp/adj
2
Q
cotθ =
secθ =
cscθ =
A
adj/hyp
hyp/adj
hyp/opp
3
Q
45°-45°-90° Triangle
A
4
Q
30°-60°-90° Triangle
A
5
Q
Law of Sines
A
sinA/a = sinB/b =sinC/c
6
Q
Law of Cosines
A
a2 = b2 + c2 – 2bc cosA
b2 = a2 + c2 – 2ac cosB
c2 = a2 + b2 – 2ab cosC
7
Q
If a < h…
A
there is no triangle.
8
Q
If a > b…
A
there is one (obtuse) triangle.
9
Q
If a > h but a < b…
A
there are two possible triangles: ∆ABC and ∆AB’C
10
Q
Area of ∆ABC
A
1/2 bc • sinA