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K = 28
2(p + l) = K
2((2l - 1) + l) = 28
(2l - 1) + l = 14
2l - 1 + l = 14
2l + l = 14 + 1
3l = 15
l = 5
p = 2l - 1
= 2(5) - 1
= 10 - 1
= 9
Jadi jawabannya adalah yang b. 9 cm.