K = jumlah sisi segitiga
= (2a-1) + (20-a) + (3a-5)
= 2a - 1 + 20 - a + 3a - 5
= 2a - a + 3a - 1 + 20 - 5
= 4a - 16
16 = 4a
= a
4 = a
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K = jumlah sisi segitiga
= (2a-1) + (20-a) + (3a-5)
= 2a - 1 + 20 - a + 3a - 5
= 2a - a + 3a - 1 + 20 - 5
= 4a - 16
16 = 4a
= a
4 = a