Trigonometry Flashcards
1
Q
Sine rule - Finding unknown angle
A
sin(A)/a = sin(B)/b
2
Q
Sine rule - Finding unknown side
A
a/sin(A) = b/sin(B)
3
Q
Cosine rule - Finding unknown side
A
a² = b² + c² - 2bc*cos(A)
4
Q
Cosine rule - Finding unknown angle
A
cos(A) = (b² + c² - a²) / 2bc
5
Q
Sin
A
opp/hyp
6
Q
Cos
A
adj/hyp
7
Q
Tan
A
opp/adj
8
Q
Sin⁻¹ vs sin
A
sin (30) = 1/2
sin⁻¹ (1/2) = 30
sin (angle) = sides
sin⁻¹ (sides) = angle
9
Q
Finding the area of a triangle using sin
A
1/2(absin(C))
a, b = lengths surrounding angle C
