Răspuns :
AD^2=DCxBD
tg30=rad din3/3=AD/BD ridicam ambii membrii la patrat si obtinem:
1/3=AD^2/BD^2 1/3=CDxBD/BD^2 1/3=CD/DB
tg30=rad din3/3=AD/BD ridicam ambii membrii la patrat si obtinem:
1/3=AD^2/BD^2 1/3=CDxBD/BD^2 1/3=CD/DB