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luAs persegi=luAs segitigA=81
luAs persegi =81
s.s=81
s=9
kel persegi=4.s
=4.9
=36
L = 1/2 x alas x tinggi
L = 1/2 x 18 x 9
L = 81 cm²
Luas persegi = sisi x sisi
sisi = √ luas =√81 =9 cm
Keliling persegi = 4 x sisi
= 4 x 9 = 36 cm