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t = 3a per 2
t=1,5a
b. L=a x t
864 = 1,5a x t
yang b kurang tau coba deh itung itung aja
L = a.t
864 = a.3/2a
864=3/2a²
864.2 = 3a²
1728 = 3a²
a² = 1728/3
a² = 576
a = √576
a =24 cm
t = 3/2a
t = 3/2.24
t= 36 cm