The diagram of the segment bisector AB shows that angle CAB is 90°
What is a segment bisector?
A segment bisector can be explained as a line or a ray that cuts across another shape or a line segment into two equal parts.
In the given information:
If Ray AB is a segment bisector of segment CD. Then we can have an imaginary assumption that CD is a straight line whereby B cuts through line CD and extends to A.
Therefore, the endpoints at C and D join at A to form a triangle, where CAB is 90°.