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jadi luas persegi= 21 cm×21cm=441cm2
klo luas persegi panjang=441cm×2=882 cm2.
s1=4x
s2=3x
dit=L persegi...?
jwb: K = 2(p+l)
84 = 2(4x+3x)
84= 14x
x=84/14
x=6
L persegi = s.s
= 6.6
=36