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Luas persegi = 361cm²
Dit: keliling persegi.......?
L = s2
361 = s²
s =√361
s = 19cm
maka:
K = 4s
K = 4x19
K = 76cm
L = s² = 361 cm²
s = √(361 cm²)
s = 19 cm
Ingat lagi : keliling = penjumlahan sisinya
K = 4s
= 4 x 19 cm
= 76 cm