Radians Flashcards
1
Q
length of sector
A
l = rθ
2
Q
Area of sector
A
A= 1/2 r^2 θ
3
Q
Area of triangle
A
1/2 absinC
4
Q
Length of triangle side
A
a^2 = b^2 + c^2 -2bcCosA
5
Q
Small angle approximations
A
Sinθ ≈ θ
Tanθ ≈ θ
Cosθ ≈1- θ^2 /2
