9. trigonometric ratios Flashcards
1
Q
sine rule for two solutions for a missing angle
sine theta=
A
sin(180-theta)
2
Q
area of a triangle
A
1/2absinc
3
Q
cosine rule
A
a2 = b2 + c2 - 2bc cos a
4
Q
cos a =
A
b2 + c2 - a2 / 2bc
5
Q
costheta=
sintheta =
tantheta =
A
A/H
O/H
O/A
6
Q
cosA=
A
b^2 + c^2 - A^2/ 2BC
7
Q
sin rule =
A
sinA/a = sinB/b
