tolong dijawab y. makasih

Kesebangunan dan Kongruen

PR/PS = PQ/PT
(12 + TR)/9 = (9 + 11)/12
(12 + TR)/9 = 20/12
(12 + TR)/9 = 5/3
3(12 + TR) = 5 x 9
36 + 3TR = 45
3TR = 45 - 36
3TR = 9
TR = 9/3
TR = 3 cm (B).

*semoga membantu. sukses selalu ^_^