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42 = 7 x d2/2
42 = 3,5d2
d2 = 42/3,5
d2 = 12 cm
Jadi, panjang QS adalah 12 cm
42 = 7 x D₂ : 2
42 x2 = 7D₂
84 =7D₂
84/7 =D₂
12 =D₂
jawabnya 12 cm