Ch5 Radians Flashcards
1
Q
π radians
A
180 degrees
2
Q
2π radians
A
360 degrees
3
Q
1 radian
A
180/π
4
Q
30 degrees
A
π/6 radians
5
Q
45 degrees
A
π/4 radians
6
Q
60 degrees
A
π/3 radians
7
Q
90 degrees
A
π/2 radians
8
Q
arc length
A
l = r x angle in radians
9
Q
Area of sector
A
A =1/2 r^2 x angle in radians
10
Q
sinθ when θ is small and in radians
A
sinθ ~ θ
11
Q
cosθ when θ is small and in radians
A
cosθ ~ 1-(θ^2/2)
12
Q
tanθ when θ is small and in radians
A
tanθ ~ θ
