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484 = 2(10.9+10.t+9.t)
484:2 = 90+10t+9t
242 = 90+ 19t
242-90 = 19t
152 = 19t ------->> t = 8 cm
p = 10 cm
l = 9 cm
Lp = 2 (p.l+p.t+l.t)
484 = 2 (10.9 + 10.t + 9.t) (kedua sisi dibagi 2)
242 = 90 + 19t
19t = 242 - 90
19t = 152
t = 152/19
t = 8 cm