Trig Lesson 2 - Sin and Cos of complementary angles

 $\sin\ 35\degree$  

 $\sin\ 55\degree$  

 $\cos55\degree$  

 $\cos145\degree$  

 $\sin82\degree$  

 $\cos8\degree$  

 $\cos82\degree$  

 $\sin98\degree$  

complementary

supplementary

a linear pair

adjacent

 $\beta+\theta=180$  

 $\beta+\theta=90$  

 $90-\beta=\theta$  

 $180-\theta=\beta$  

 $\theta-90=\beta$  

 $\cos\angle B$  

 $\frac{AB}{BC}$  

 $\sin\angle C$  

 $\cos\angle C$  

$\sin15\degree=\cos65\degree$

$\sin70\degree=\cos20\degree$

$\cos43\degree=\sin47\degree$

$\sin12\degree=\cos78\degree$

$\cos B=\frac{6}{10}$

$\sin C=\frac{8}{10}$

$\tan B=\frac{8}{6}$

$\sin B=\cos C$

$\sin B=\frac{8}{10}$