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Verified answer
Bab Bangun DatarK = 90 cm
l = p - 5
K = 2(p + l)
90 = 2(p + p - 5)
45 = 2p - 5
50 = 2p
p = 25 cm
l = p - 5
l = 25 - 5 = 20 cm
a. p : l = 25 : 20
= 5 : 4
b. L = pl
= 25 • 20
= 500 cm²