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Verified answer
Jawabmisal p : l : t = 3 ; 4 : 5
p = 3a
l = 4a
t = 5a
d= diagonal ruang = 20√2
p^2 +l^2 +t^2 = d^2
(9+16+25) a^2 = (20√2)²
50 a²= 800
a² = 16
a= 4
rusuk terpanjang = 5a= 20 cm