Question

O is the centre of the circle,prove that angle OAC and angle ABC=90 degree​

Answer 1

Answer:

What you are asking is technically impossible.

If we somehow prove that <ABC is 90°.

Then, <BAC is definitely less than 90°

<OAC has to be in the interior part of <BAC, so, it will also be less than 90°

So, it is impossible to prove both of them to be 90°