Répondre :
soit r le rayon du disque
alors sin(13°)=r/(r+50)
sin(13°)(r+50)=r
r(1-sin(13°)=50*sin(13°)
r=50*sin(13°)/(1-sin(13°)
r=14,512 m
alors sin(13°)=r/(r+50)
sin(13°)(r+50)=r
r(1-sin(13°)=50*sin(13°)
r=50*sin(13°)/(1-sin(13°)
r=14,512 m