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= 18 √3
LΔ ABC = 1/2 . p.l --> Tg 30 = l/p
p = l / tg 30
= l / (1/√3)
= l√3
1/2. p. l = LΔABC
1/2. (l√3).l = 18√3
l² = 36
l = 6 ---> p = l√3
= 6√3