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/_ AOC =/_ AOB+/_ BOC
=60+°30
=90°
Arc ABC Subtands /_ AOC at centre of circle ,
And /_ ADC on point D
: /_ AOB = 2 /_ ADC
90° = 2 /_ ADC
2 /_ ADC = 90°
/_ ADC = 1/2 × 90°
/_ ADC = 45°
LO. This is my answer
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