9. Trigonometric Ratios Flashcards
1
Q
What is the cosine rule?
A
a2 = b2 + c2 - 2 b c Cos A
b, c and A = two sides and the included angle
2
Q
What are the equations for trigonometry?
A
sin x = opposite / hypotenuse
cos x = adjacent / hypotenuse
tan x = opposite / adjacent
3
Q
What is the sine rule?
A
a b c
——- = ——- = ——-
Sin A Sin B Sin C
4
Q
What is the equation for a triangle?
A
Area = 1/2 a b Sin C
5
Q
What are the main points of the sine graph?
A
(0 , 0), (90, 1), (180, 0), (270, -1)
6
Q
What are the main points of the cosine graph?
A
(0 , 1), (90, 0), (180, -1), (270, 0)
7
Q
What are the main points of the tan graph?
A
(0 , 0), (180, 0), asymptotes: x = 90, 270
