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RiaMariaS:
180°
no thats not the answer
options are 210 ,220,230,240
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x+y =180°
Hope this helps
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in triangle AOB
50+90+ANGLE B=180 angle sum property
angleB=40
50+40=x. exterior angle property of triangle
90=x
hence it is cyclic quadilateral
X+y=180°
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