solve this question correctly
find X &y
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a+30 = 90
a=60
a+60+o = 180
o = 60
then x= 30 ( < suspended on the centre of circle by an arc is double by the angle on other part of circle by same arc
30+90+c= 180
c= 50
30+ 50+30+y = 180
y= 70
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