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84 = 2 ( 4x + 3x )
84 = 8x + 6x
84 = 14x
x = 84 : 14
x = 6
4x : 3x
keliling persegi pjg
k = 2(p +l)
84 = 2 (4x + 3x)
84 = 2(7x)
84 = 14x
x = 6
maka,
panjang= 4x6= 24
lebar= 3x 6= 18
luas= pxl
=24 x 18
= 432 cm persegi