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4 × s1 = 68
s1 = 68 : 4
s1 = 17 cm
s2 = s1 + 9
s2 = 17 + 9
s2 = 26 cm
K2 = 4 × s2
K2 = 4 × 26 cm
K2 = 104 cm
Pertambahan keliling
= K2 - K1
= 104 - 68
= 36 cm