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= 7/5 x 15
= 21 cm
K = 2 (P+L)
= 2 (21+15)
= 2 (36)
= 72 cm
p : 15 = 7 : 5
=
p = = 21
p = 21 cm
l = 15 cm
k = 2(p+l) = 2(21 cm + 15 cm) = 2(36) = 72 cm