Question

Exercitiul 2 va rog.

Answer 1

suma masurilor unghiurilor in jurul unui punct este 360 de grade

m(<AOB)+m(<BOC)+m(<COD)+m(<DOE)+m(<EOA)=360 grade
(x+10)+40+(2x+10)+100+(3x+20)=360
6x+180=360
6x=360-180
x=180:6
x=30 de grade

m(<AOB)=x+10=40 de grade
m(<COD)=2x+10=60+10=70 de grade
m(<EOA)=3x+20=90+20=110 grade

Verificare: 40+40+70+100+110=360 de grade