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l = 4√3 - 2
=> L = p × l
= (5 + 2√3) (4√3 - 2)
= 20√3 - 10 + 24 - 4√3
= 16√3 + 14
disederhanakan menjadi 8√3 + 7
itu sih kalo gasalah yaaa hhehe ._.
L=4√3-2
Luas = P × L
= (5+2√3)(4√3-2)
luas=16√3+14 cm²