Question

va rogggg ma nevoie urgent de ele dau coroana​

Answer 1

11-a=20°(BIC tr. isoscel, I=100 rezulta in tr. BIC unghiul IBC/ICB=40 =>B/C=80=>A=20)

12-x+y=180(doua unghiuri consecutive intr-un traoez formeaza adunate 180°)

13-BAC=60°(BAC echilateral,jumatate din rombul OBAC)

14-tr.ABC=tr. dreptunghic=>u.ABC=30°

15-tr.echilateral=>x=60°