Panjang
K = 2 × (p + l)
K = 2p + 2l
28 = 2(p) + 2(9)
28 = 2p + 18
2p = 28 - 18
2p = 10
p = 10/2
p = 5 cm
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Panjang
K = 2 × (p + l)
K = 2p + 2l
28 = 2(p) + 2(9)
28 = 2p + 18
2p = 28 - 18
2p = 10
p = 10/2
p = 5 cm