Question

In the given figure O is the center of the circle. If angle ACB =40*, the prove that the reflex angle AOB is 280*.

Answer 1

Heya Dear ☺

There is a theorem is class 9 that the angle subtended at the centre is double than the angle opposite to that very chord or a point

means <x=80 (by the theorem)

Now the centre angle forms reflex angle that is 360°

So <AOB=360°-<x
360-80= 280°

hence AOB= 280°.
proved

Hope it helps you ☺

Answer 2

hey I hope this will help you ....:-):-)