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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