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2014-11-05T22:46:38+02:00
A)x+130+80=360
x+210=360
x=360-210
x=150 grade
AOC=150 grade

b)EOD=90 grade
DOC=2x+20
COB=50 grade
BOA=x
AOE=4x-10
90+2x+20+50+x+4x-10=360
150+7x=360
7x=360-150
7x=210
x=210/7=30 grade
DOC=2x+20=2·30+20=60+20=80 grade
BOA=x=30 grade
AOE=4x-10=4·30-10=110 grade
90+80+50+30+110=360 grade
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