Pure: Chapter 5 - Radians Flashcards
1
Q
π =
A
180°.
2
Q
Arc Length equation (radians):
A
L = r θ
(Arc Length = Radius X Angle)
3
Q
Arc length equation (degrees):
A
L = 2πr (θ / 360)
4
Q
Area of sector (radians):
A
A = 1/2 r^2 θ
5
Q
Area of sector (degrees):
A
A = π r^2 (θ / 360)
6
Q
Area of segment (radians):
A
1/2 r^2 (θ - sin θ)
7
Q
Area of segment (degrees):
A
Sector Area - Triangle Area (possibly Sin rule).
8
Q
Small Angle Approximations
sin θ =
A
θ
9
Q
Small Angle Approximations
cos θ =
A
θ
10
Q
Small Angle Approximations
tan θ =
A
1 - [(θ)^2 / 2]
