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AB+BC+AC = 135
AB= 4/15 x 135 = 36
2. a: t = 5:3
mis: a= 5a
t= 3a
L = 1/2 x a x t
= 1/2 x 5a x 3a
120= 1/2 x 15a2
240= 15a2
a2. = 16
a. = 4
a = 5a = 5.4 = 20 cm