To find conjecture about regular polygon, use the formula [tex] \frac{360}{n} [/tex]
Where, n = number of sides of the regular polygone
1) Triangle
n =3
So, Conjecture of the triangle = [tex] \frac{360}{3} [/tex] = 120
2) Square
n =4
So, Conjecture of the square = [tex] \frac{360}{4} [/tex] = 90
3) Pentagone
n = 5
So, Conjecture of the pentagon = [tex] \frac{360}{5} [/tex] = 72
4) Hexagone
n = 6
So, Conjecture of the pentagon = [tex] \frac{360}{6} [/tex] = 60.