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d1 = yN-yL =7-0 =7
d2= xM - xK =7 - 1 = 6
L =1/2 X d1 x d2
= 1/2 x 7 x 6
= 21 SL
*tidak ada dioption.. Mungkin itu yg A. 12 terbalik tulisnya...