a)
450 elevi................360°
100 elevi................x°
x=100×360°/450=80°
450 elevi................360°
75 elevi..................x°
x=75×360°/450=60°
450 elevi................360°
125 elevi................x°
x=125×360°/450=100°
450 elevi................360°
150 elevi................x°
x=150×360°/450=120°
b)
360°.......................100
80°...........................x
x=80°×100/360=22,(2)=22
360°.......................100
60°...........................x
x=60°×100/360=16,(6)=17
360°.......................100
100°...........................x
x=100°×100/360=27,(7)=28
360°.......................100
120°...........................x
x=120°×100/360=33,(3)=33