Answer:

• Hexagon = 720°
• Dodecagon = 1800°
• 14-gon = 2160°
• Nonagon = 1260°
• Decagon = 1440°

Step-by-step explanation:

Sum of interior angles = (n-2)180°

Hexagon = 6 sides

• (6-2)180°
• (4)180°
• 720°

Dodecagon = 12 sides

• (12-2)180°
• (10)180°
• 1800°

14-gon = 14 sides

• (14-2)180°
• (12)180°
• 2160°

Nonagon = 9 sides

• (9-2)180°
• (7)180°
• 1260°

Decagon = 10 sides

• (10-2)180°
• (8)180°
• 1440°