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Verified answer
Panjang = 8+Llebar = L
kll persegi panjang = 2(p+l)
36 = 2(8+L+L)
36 = 2(8+2L)
36 = 16+4L
36-16 = 4L
20 = 4L
L = 20/4
L = 5
panjang = 8+L = 8+5 = 13cm
lebat = L = 5cm
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