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x 8
----- = -------
x + 3 12
12x = 8(x + 3)
12 x = 8x + 24
12x - 8x = 24
4x = 24
x = 6
jadi PS = 6 cm
kalau saya pake perbandingan
8 : 12 itu 2 :3
x : 3 harus 2: 3 juga
panjang SQ itu baru 1/3 dari panjang sebenarnya
jadi, 3 x 3 = 9 - 3 = 6 cm