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S = √L
S = √225
S = 15 cm
K = 4 × S
K = 4 × 15 cm
K = 60 cm
225= s²
s= √225
s= 15 cm
K. persegi= 4(s)
= 4(15)
= 60
Jadi, keliling persegi tersebut adalah 60 cm.