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2p = 5l
P = 5/2l
pl = 90cm²
5/2l x l = 90cm"
5/2l" = 90cm"
l" = 36
l = 6 cm
p = 15 cm
sisi persegi = 2/3p
s = 2/3 p
s = 2/3 x 15 cm
s = 10 cm
l = s"
l = 10"
l = 100cm"