IfΔABC~ΔPQR,perimeter of ΔABC=32cm,perimeter of ΔPQR=48cm and PR=6cm,then find the length of AC

IfΔABC~ΔPQR,perimeter of ΔABC=32cm,perimeter of ΔPQR=48cm and PR=6

1.	IfΔABC~ΔPQR,perimeter of ΔABC=32cm,perimeter of ΔPQR=48cm and PR=6cm,then find the length of AC
Answer» How?? Explain 4cm AC=4