Question

1. The figure shows two concentric circles and AD is a chord of larger circle. O А B D С Prove that : AB = CD.​

Answer 1

Answer:

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Step-by-step explanation:

I hope you mean this diagram...

AD=AB+BC+CD

AD=AC+BD

AC=AB+BC

BD=BC+CD  

AD=AC+BD

as BC is common

AC=BD

AB+BC=BC+CD    cut BC as common

So, AB=CD Thus, proved!