Question

am nevoie de ajutor la punctul b de la 1 si 2​

Answer 1

Răspuns:

Explicație pas cu pas:

1b)

∡ABC=75°

∡DBC=75°/2=37°30'

∡ADB=180°-(37°30'+30°=180°-67°30'=112°30'

∡BDC=180°-(37°30'+75°)=180°-112°30'=67°30'

2b

∡ACB=∡ABC=70°

∡BAC=180°-140°=40°

∡ABD=70°-20°=50°

∡BBC?????