As shown in the diagram(如图),the triangle PQR has PR=14cm and PQ=10cm. The side RQ pr

As shown in the diagram(如图)the triangle PQR has PR=14cm and PQ=10cm. The side RQ produced meets the perpendicular PS at S, so that QS=5cm. The perimeter(周长) of triangle PQR is _____cm

答案

30 

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