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K = 60 cm
mk :
K = 4 x sisi
60 = 4 x sisi
sisi = 60/4
sisi = 15 cm
jadi Luas = sisi x sisi
= 15 x 15
= 225 cm² (D)
60 = 4s
s = 60/4
s = 15 cm
luas= s x s
= 15 x 15
= 225 cm²