Question

plsss help my dau 20 de puncte si coroana plss repede​

Answer 1

a)

AOD=COB=x

AOC=DOB=30

AOD+COB+AOC+COB=360° unghiuri in jurul unui punct

30•2+2x=360

2x+60=360

2x=360-60

x=300:2

x=150

AOD=COB=150°

b)AOD=COB=90+x

AOC=COD=x

AOD+COB+AOC+COB=360° unghiuri in jurul unui punct

(90+x)•2+2x=360

180+2x+2x=360

4x=360-180

x=180:4

x=45°

AOD=COB=45+90=135°

AOC=COD=45°

c) este in poza

d) se rezolva la fel ca astea