tolong nomer 25 ya kak

Lp = 2(p × l) + 2(l × t) + 2(p × t).
168 = 2(6 × l) + 2(l × 4) + 2(6 × 4).
168 = 2(6l) + 2(4l) + 2(24).
168 = 12l + 8l + 48.
168 = 20l + 48.

20l = 168 - 48.
20l = 120.
l = 120/20.
l = 6cm.

Jawaban : D.