Polygon Interior Angle Sum Theorem

What is the formula for the Polygon Interior Angle Sum Theorem?

• $\left(n\ -\ 2\right)\ \times\ 180$

• $\left(n\ -\ 180\right)\ \times2$

• $n\times180$

• $\left(\pi r^2-180\right)\times2$

Using the Polygon Interior Angle Sum Theorem, what is the interior angle sum of a  9-sided irregular polygon?

• $1240\degree$

• $720\degree$

• $901\degree$

• $900\degree$

What part of the Polygon Interior Angle Sum Theorem tells you how many triangles make up a particular polygon?

• $\left(n-2\right)\times180$

• $n$

• $\left(n-2\right)$

In the Polygon Interior Angle Sum Theorem, what does $n$  represent?

• The measure of the largest interior angle

• The number of sides of the polygon

• Nothing

• The number of triangles that compose the polygon

How many sides would an irregular polygon have if the  interior angle sum is $1800\degree$  ?

• 20 sides

• 21 sides

• 12 sides

• 180 sides

The sum of the Exterior Angles of an Irregular Polygon must sum to what degree value?

• $360\degree$

• $180\degree$

• $90\degree$

• $98.7\degree$

If a five sided irregular polygon has the following known exterior angles measures:
 $36\degree$    $124\degree$   $74\degree$   $56\degree$  
What is the fifth exterior angle measure?

•  $70\degree$  

•  $71\degree$  

•  $10\degree$  

•  $0\degree$  

Starting at one vertex, what is the maximum number of non-overlapping triangles that can be constructed within a 22-sided irregular polygon?

• 20

• 22

• 1

• 23