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Since RST~RXZ, SR/TR=XR/ZR
18. SR=4, TR=8, XR=2
So 4/8=2/ZR, ZR=4,
Therefore z(4,0)
19. SR=6, TR=6, XR=2
So 6/6=2/ZR, ZR=2,
Therefore z(2,0)
20. SR=10, TR=20, XR=6
So 10/20=6/ZR, ZR=12,
Therefore z(12,0)
21. SR=7, TR=9, XR=4
So 7/9=4/ZR, ZR=36/7,
Therefore z(36/7,0)
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