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ABCD is a cyclic quadrilateral such that...

ABCD is a cyclic quadrilateral such that `/_A = ( 4y + 20) ^(@), /_B = ( 3y - 5)^(@), /_C = ( 4x)^(@) ` and `/_ D = ( 7x + 5)^(@)` . Find the four angles.

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The correct Answer is:
` therefore angle A -120^(@) ,angle B=70^(@) angle C -60^(@) and angle D - 110^(@) `
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