radians - year 2 chapter 5 Flashcards
1
Q
arc length
A
๐ฮธ
2
Q
area of a sector
A
0.5 x ๐ x ๐ x ฮธ
3
Q
area of a segment
A
area of sector - area of triangle
0.5 x ๐ x ๐ (ฮธ-sinฮธ)
4
Q
1 radian =
A
180/ฯ
5
Q
small angle approximation
sin
A
sinx = x
6
Q
small angle approximation
tan
A
tanx = x
7
Q
small angle approximation
cos
A
cosx = 1-ฮธxฮธ/2
