Question

click on the image and pls solve it with step by step explanation​

Answer 1

Answer: <ACB=50°

Step-by-step explanation

AO = BO (radius)

<OAB = <OBA (base angles of isosceles triangle)

<AOB = 180-(40+40)

<AOB = 180-80 = 100  (angle sum property of triangle)

The angle subtended on the center of a circle by a chord is twice the angle subtended by the same chord on the remaining part.

⇒<AOB = 2<ACB

      100 = 2<ACB

  <ACB = 100/2 = 50°