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K persegi pjg= 2(p+l)
56 = 2(4x+3x)
56 = 2(7x)
56= 14x
x= 4
maka panjang= 4x
=4 x 4= 16cm
lebar= 3 x 4= 12 cm
perbandingan = 4:3
panjang= 4/7 × 56 = 32:2 = 16
lebar = 3/7 × 56 = 24:2 = 12
jadi panjang 16 dan lebar 12
cat: Keliling persegi adalah 2×p+2×l
= 2×16+2×12
=32+24= 56