Answer:
AB is not tangent to the circle.
Explanation:
A tangent is a straight line that touches a circle at only one point.
The tangent of a circle is always perpendicular to the radius.
Therefore, if AB is tangent to the circle, it will form a right angle with the radius, CA.
To determine if AB is tangent, we can use Pythagoras Theorem.

If AB is tangent, then angle CAB will be a right angle. So AC and AB would be the legs of the right triangle, and BC would be the hypotenuse.
Therefore:

Substitute the values into the equation:



As 193 ≠ 225, the equation does not hold, hence proving that AB is not tangent to the circle.