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K = 2 (p + l)
120 = 2 (p + 25)
120 = 2p + 50
70 = 2p
p = 35cm
b.
L = p x l
L = 35 x 25
L = 875cm2
120 = 2 x (p+25)
60 = p + 25
p = 35 cm
Lpp = p x l
= 35 x 25
= 875 cm²