I couldn't understand the answer to this question,please explain again.If two chords AB and CD of a circle AYDZBWDX intersect at right angle ( see figure below ),prove that

Question

I couldn't understand the answer to this question,please explain
again If two chords AB and CD of a circle AYDZBWDX intersect at
right angle ( see figure below ),prove that

Koka Sri Lakshmi Divya Sai · Accepted Answer

$let \overset{︷}{C X A} = x^{0} \overset{︷}{B D Z} = 90 - x^{0} {Chords CXA and BDZ subtend a combained angle 90}^{0} Similarly \overset{︷}{AYD} \to z^{0} \overset{︷}{CWD} \to 90 - z^{0} \Rightarrow Arcs AYD and CWD joins {make an angle of 90}^{0} on the circumference ∴ \overset{︷}{AYD} + \overset{︷}{CWD} = 90^{0} = semicircle$

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