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l = x = 3
keliling= 2(p+l)
= 2(9+3)
= 24
itu satuannya apa?
l= x
x= 3
Maka :
p= 3x
= 3(3)
= 9
l= x
= 3
K. persegi panjang :
2(p + l)
2(9 + 3)
2(12)
24