L1 =a×t : 2
L1 =12x28:2
L1 =168
L2 =pxl
L2 =12×28
L2 =336
L3 =axt : 2
L3 =12×6:2
L3 =36
Ltotal=36+336+168
Ltotal=540
(D) adalah jawabannya
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L1 =a×t : 2
L1 =12x28:2
L1 =168
L2 =pxl
L2 =12×28
L2 =336
L3 =axt : 2
L3 =12×6:2
L3 =36
Ltotal=36+336+168
Ltotal=540
(D) adalah jawabannya