AB/sin(C) = BC/sin(A)
4√3/sin(120°) = 4/sin(A)
(4√3)/(1/2 . √3) = 4/sin(A)
8 = 4/sin(A)
sin(A) = 4/8 = 1/2
A = 30°
L = 1/2 . AB.BC.sin(A)
= 1/2 . 4√3.4.1/2
= 2√3 . 2
L = 4√3 cm²
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AB/sin(C) = BC/sin(A)
4√3/sin(120°) = 4/sin(A)
(4√3)/(1/2 . √3) = 4/sin(A)
8 = 4/sin(A)
sin(A) = 4/8 = 1/2
A = 30°
L = 1/2 . AB.BC.sin(A)
= 1/2 . 4√3.4.1/2
= 2√3 . 2
L = 4√3 cm²