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l = p - 1
kel. persegi panjang = 2(p + l)
2(p + l) = 30
2(p + (p - 1) = 30
p + p - 1 = 30/2
2p - 1 = 15
2p = 16
p = 8 cm
l = 7 cm
L = P x l
= 8 x 7 = 56