Question

12
Va roggggggggggggggggg!

Answer 1

Răspuns:

Explicație pas cu pas:

arc mare AB = 2*arc mic AB

arc mare AB + arc mic AB = cerc

2*arc mic AB + arc mic AB = 360°

3*arc mic AB = 360°

arc mic AB = 360° : 3 = 120°

<AOB = arc mic AB = 120°

OA = OB (raze) ⇒ ΔOAB isoscel

<OAB = <OBA = (180° - <AOB) : 2 = (180° - 120°) : 2 = 60° : 2 = 30°