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maka:
4 , 12 , 24
4+0 , 8+4, 12+(4+8)
Un = 4n+(n/2)((n-1)4)
rumus banyak tusuk gigi = 2n+2n²
144 = 2n+2n²
0 = 2n²+2n-144
0 = 2(n+9)(n-8)
n = -9 atau n = 8 ← ambil yang positif
maka tusuk gigi tiap sisi adalah 8.......opsi D