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Keliling : 2 x (Panjang + Lebar)
contoh : Panjang = 6 cm
Lebar = 4 cm
Keliling = 2 x (6 + 4)
= 20 cm
Luas : Panjang x Lebar
contoh : Panjang = 8 cm
lebar = 5 cm
Luas = 8 x 5
= 40 cm2
Rumus Persegi
Keliling : 4 x Sisi
contoh : Sisi = 5 cm
Keliling = 4 x 5
= 20 cm
Luas : Sisi x Sisi
contoh : Sisi = 5 cm
Luas = 5 x 5
= 25 cm2
persegi luasnya s×s kelilingnya 4×s