1. What is the sum of the interior angles of a nonagon?
2. Which of the following best describes this polygon?

irregular heptagon
regular nonagon
irregular nonagon
regular heptagon

Question

1.   What is the sum of the interior angles of a nonagon?
2.   Which of the following best describes this polygon? 

 irregular heptagon 
 regular nonagon 
 irregular nonagon 
 regular heptagon

anonymous · Answer

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anonymous · Answer

Try to divide the nonagon into triangles. Do you know what is the sum of angles in a triangle?

For the second part - firstly check how many sides does it have, so that you can tell if it's a nonagon (9 sides) or heptagon (7 sides). A polygon is regular when all its angles are congruent and all sides are equal. Is this one like that?