trigonometry Flashcards
1
Q
when do we use the Sin rule in irregular triangles?
A
when we have two sides and their opposite angles
2
Q
when do we use the Cos rule in irregular triangles?
A
in a situation when we have three sides and a shared angle
3
Q
what it the Cos rule?
A
a²=b²+c²-2bc x Cos (A)
4
Q
what is the formula of the area of an irregular triangle
A
1/2 ab x Sin (C)
5
Q
what is the Sin rule?
A
sin(A)/a = sin(B)/b
