here, the total dishes = 10
dishes having meat = 3 ( chicken, meatloaf and hamburger )
thus, the probability of having meat on the chosen dishes = number of dishes having meat / total dishes
therefore, the probability of not having meat = 1- the probability of having meat on the chosen dishes
⇒ option b is correct.
The two triangles are equal.
Since the triangle at isosceles, two sides/angles are equal.