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= 180⁰ - 120⁰
= 60⁰
Cos A = AD/AC
AC = AD/Cos A
AC = 8/Cos 60⁰
AC = 8/(1/2)
AC = 16
BC = AC sin 60°
BC = 16 (1/2√3)
BC = 8√3
K = AD + AC + BC
K = 8 + 16 + 8√3
= 24 + 8√3