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Verified answer
Kesebangunan dan KongruenPT/PQ = PS/PR
12/20 = 9/12+TR
3/5 = 9/12+TR
3(12+TR) = 9 x 5
36 + 3TR = 45
3TR = 45-36
3TR = 9
TR = 9/3
TR = 3 cm (B).
*semoga membantu. sukses selalu ^_^