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s= √225
s= 15
keliling = 4.s
keliling = 4.15
keliling = 60 cm
L = 225 cm²
dik :
L = sisi²
225 = sisi²
sisi = √225
sisi = 15 cm
jdi :
K = 4 x sisi
= 4 x 15
= 60 cm