梯形个数为1,图形周长为5a,
梯形个数为2,图形周长为8a,8a=5a+3a,
梯形个数为3,图形周长为11a,11a=8a+3a,
梯形个数为4,图形周长为:11a+3a=14a,
梯形个数为5,图形周长为:14a+3a=17a,
…,
依此类推,梯形个数为n,图形周长为:(3n+2)a,
故答案为:(3n+2)a.
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