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30 = 6a
a = 5
Sisi
a = 5 cm
2a = 2.5 = 10 cm
3a = 3.5 = 15 cm
30 = a + 2a + 3a
30 = 6a
30/6 = a
5 = a
sisi terpanjang = 3a
= 3 × 5
= 15 cm