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A] \'Ecrire le tableau des angles remarquables du cours avec leurs sinus et leurs cosinus\vskip 5cm


B]
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	Sachant que $AB= 50$m, que $\widehat{BAD} = 40^\circ$ et que $\widehat{CBD} = 50^\circ$
	
	1) Montrer que $CD = BC\times \tan 50^\circ$ et que $CD = AC\times \tan 40^\circ$
	
	2) Sachant que $AC = 50+BC$ en déduire que : 
	
	\hfil $BC\tan50^\circ-BC\tan40^\circ = 50\tan40^\circ$
	
	3) En déduire la longueur exacte de $BC$ puis celle de $CD$
	
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