Question

1. In the given figure, O is the centre of the
circle. ZOAB and ZOCB are 30° and 40°
working
B
40°C
30°
C
A
respectively. Find ZAOC. Show your steps of​

Answer 1

Answer:

140 degree

Step-by-step explanation:

let us join 'O' to 'B' and get OB

Now we get to isosceles triangles OBC And OBA,

So angle OBC will be 40 degree and angle OBA will be 30 degree(As OBC and OBA are both isosceles tringle)

Then angle ABC will be 70 degree

Now we get angle AOC will be 140 degree (As we know the central angle of a circle is twice of its inscribed angle)

Hence the answer will be 140 degree