Răspuns:
1) ΔKMO ≡ ΔLNO
LN ≡ KM = 7 cm
2) ΔKLM ≡ ΔDEF
m(∠DEF) = 30°
m(∠DFE) = 180° - (30° + 40°) = 180° - 70 = 110°
3) m(∠BAC) = 180° - 46° = 134°
ΔABC = isoscel =>m(∠ABC) = (180° - 134°)/2 = 23°
4) ΔABC = isoscel => AC = BC
AB = P(ABC) - (AC + BC) = 26cm - 18cm = 8 cm
AD = AB/2 = 8cm/2 = 4 cm
