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L = d1 x d2
-----------
2
96 = 12 x ( x + 3 )
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2
2 x 96 = 12 x ( x + 3)
2 x 96 = x + 3
--------
1 2
16 = x + 3
16 - 3 = x
x = 13 cm
b. panjang QS = X + 3
= 13 + 3
= 16 CM