Chapter 4
Trigonometry
=
=
=
=
^åÖäÉëW=αI=β=
oÉ~ä=åìãÄÉêë=EÅççêÇáå~íÉë=çÑ=~=éçáåíFW=ñI=ó==
tÜçäÉ=åìãÄÉêW=â=
=
=4.1 Radian and Degree Measures of Angles
=
362. RTNTDQR?
NUM
Nê~Ç ≈ °
π°
= =
=
- ê~Ç MKMNTQRPê~Ç
NUM
N ≈
π
°= ==
- ê~Ç MKMMMOVNê~Ç
NUMSM
ND ≈
⋅
π
= ==- ê~Ç MKMMMMMRê~Ç
NUMPSMM
N? ≈
⋅
π
= ==
=
^åÖäÉ=
EÇÉÖêÉÉëF=M= PM= QR= SM= VM= NUM= OTM= PSM=
^åÖäÉ=
Eê~Çá~åëF= M= Sπ
=
Qπ
=
Pπ
=
Oπ
= π=
OPπ
= O=π
=
=
=