An ant walks in a straight line on a plane leaving behind a trace of its movement. The initial position of the ant is at point $\mathrm{P}$ facing east.
The ant first turns $72^{\circ}$ anticlockwise at $\text{P}$, and then does the following two steps in sequence exactly FIVE times before halting
1. moves forward for $10 \mathrm{cm}$.
2. turns $144^{\circ}$ clockwise.
The pattern made by the trace left behind by the ant is
$\text{PQ=QR=RS=ST=TP=10 cm}
$\text{PQ=QR=RS=ST=TU=UP=10 cm}$
$\text{SQ=QT=TR=RP=PS=10 cm}$
$\text{SQ=QT=TR=RP=PS=10 cm}$
