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Keliling = 2(p+l)
36 = 2(13+l)
36 = 26 + 2l
36-26 = 2l
10 = 2l
10/2 = l
5 = l
Luas = p x l
= 13 x 5
= 65 cm²
K : 4s
36 : 4s
36/4 : s
9 : s
L : 9 x 9
: 81
Maaf klo salah