Răspuns:
Explicație pas cu pas:
m(<AOB) =x-30°
m(<BOC) =x+20°
m(<COD) =x-10°
m(<DOE) =x+5°
m(<EOF) =x+10°
m(<FOA) =x-15°
m(<AOB) +m(<BOC) +m(<COD)+m(<DOE)+m(<EOF)+m(<FOA) =360°=>
x-30°+x+20°+x-10°+x+5°+x+10°+x-15° = 360° =>
6x-20° = 360° => 6x = 380° => x = 380°:6 => x = 63°20'
m(<AOB) =x-30° = 63°20'-30° = 33°20'
m(<BOC) =x+20°= 63°20'+20° = 83°20'
m(<COD) =x-10°= 63°20'-10° = 53°20'
m(<DOE) =x+5°= 63°20'+5°=68°20'
m(<EOF) =x+10°= 63°20'+10°=73°20'
m(<FOA) =x-15°= 63°20'-15° = 48°20'
m(<AOM) = m(<MOB) = m(<AOB):2 = 33°20' : 2 = 16°40'
m(<BON) = m(<NOC) = m(<BOC):2 = 83°20':2 = 41°40'
m(∡MON) = m(∡MOB)+m(∡BON) = 16°40'+41°40' = 58°20'
#copaceibrainly