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= 9x * 4x
= 36x^2
Keliling = 2(P + L)
= 2(9x + 4x)
= 2(13x)
= 26x
26x = 130
x = 130/26
x = 5
36x^2 = 36(5)^2
= 36(25)
= 900 m^2