Răspuns :
DD' _l_ BC ; <)C =60 grade ; => <)CDD' =30 grade
=>D'C =DC/2 =10/2 =5 cm
BD' =AD =7 cm
=>BC =7+5 =12 cm
LM = AD+BC/2 =7+12/2 =19/2 =9.5 cm
=>D'C =DC/2 =10/2 =5 cm
BD' =AD =7 cm
=>BC =7+5 =12 cm
LM = AD+BC/2 =7+12/2 =19/2 =9.5 cm