Question

find the value of x​

Answer 1

<ACB = 90°
<D + < B =180° ( cyclic quadrilateral )
<B = 60°
< BAC + < BCA +<B = 180°
SO, X = 30°

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Answer 2

<ADC+<ABC=180(Two pairs of adjacent angles add up to 180 degrees).
Therefore;
<D+<B =180
<B=180-120
=60
<ACB=90
<ACB+<CAB+<B=180
So;
x=30