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108cm² =p x 9cm
p = 108cm² : 9cm
= 12cm
K = 2(p+l)
= 2( 12cm + 9cm)
= 42cm
smoga mmbntu :)
108 = 9.l
l = 108/9=12
kell = 2 (p+l)
=2(9+12)
= 42 cm