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Panjang = lebar
lebar = 8-x
keliling = 2x+24
kel = 4s
2x+24 = 4(8-x)
2x+24 = 32x-4x
6x = 8
x = 8/6
panjang = 8-x
= 8-8/6
= 40/6
semoga membantu :D. kalau mau tanya silahkan