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p - l = 8
p = l + 8
masukan ke rumus keliling
K = 2(p + l)
32 = 2 (l+8 +l)
32 = 2 (2l + 8)
32 = 4l + 16
16 = 4l
4 = l
subtitusikan mencari (p)
p = l + 8
p = 4 + 8
p = 12
jadi ukuran panjang dan lebar persegi panjang nya adalah 12cm dan 4 cm
LEBAR =4
JADI........
12+4+12+4 = 32