1. In the diagram, $ABC$ is a right-angled triangle and $DEF$ is a semicircular arc.

In triangle $ABC$

The points $D$ and $F$ lie on $AC$ so that $DF$ is the diameter of the semicircular arc $DEF$
The radius of the semicircular arc is 3cm.

Work out the length of $AFEDC$
Give your answer correct to 2 significant figures.