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## Answers

let angle ADC be x now angle ABC is 180-x

since AD is parallel to BC

therefore angle ADC+angleDAB is 180

angle DAB is 180-x

now angle DAB and ABC r equal

so AB=CD

Let ADC=x

So, abc=180-x

Since ad//bc

Bcd=abc=90

Adc=bad=90

So.ab=dc

So, abc=180-x

Since ad//bc

Bcd=abc=90

Adc=bad=90

So.ab=dc