RRR is the midpoint of PSPSPS .
QQQ is the midpoint of PR.PR.PR. .
PR=RS=3PR=RS=3PR=RS=3
QR=12PRQR=\frac{1}{2}PRQR=21PR
So,
QR=12×3=1.5QR=\frac{1}{2}×3=1.5QR=21×3=1.5
PR=RSPR=RSPR=RS
therefore,
QS=QR+RSQS=QR+RSQS=QR+RS
QS=1.5+3=4.5QS=1.5+3=4.5QS=1.5+3=4.5
QS=4.5(Answer)QS=4.5(Answer)QS=4.5(Answer)
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