Construct a line segment of length $6.9 \mathrm{cm}$. using ruler and compass. 

Draw any circle and mark a point $A$ such that $A$ is on the circle.

Draw any circle and mark point $B$ such that $B$ is in the interior of the circle.

Draw any circle and mark point $C$ such that $C$ is the exterior of the circle.

Draw a line segment $PQ=5.8 \mathrm{cm}$ and construct its perpendicular bisector using ruler and compass.

Ravi made a line segment of length $8.6 \mathrm{cm}$. He constructed a bisector of $AB$on $C$. Find the length of $AC \text{and} BC$.