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4 - akar3 per 3 akar2
keliling = 2 ( 4 + akar3 per 3akar2 + 4 - akar3 per 3akar2 ) = 2 ( 4 + 4 ) = 16
luasnya = (4 + akar3 / akar18) (4 - akar3 / akar18)
luas = 16 - 3/18 = 15 5/6