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Keliling persegi = 4s
4s = 48 cm
s = 48 : 4 = 12 cm
Jadi sisinya 12 cm = 12 : 10 = 1,2 dm
b. Luas persegi = s²
= 1,2² = 1,44 dm²
:)
= 1,2 dm
b. luas = s x s
= 1,2 x 1,2 = 1,44 dm²