1. 
If the number of sides in a polygon was doubled, the sum of its interior angles would increase by 720. How many sides does the original polygon have? 

2. 
If the measures of five interior angles of a hexagon are 143, 166, 109, 102, and 92, what is the measure of the other interior angle? 

3. 
What is the number of sides in a regular polygon in which the measure of an interior angle is twelve more than six times the measure of an exterior angle? 

4. 
If the measures of ten interior angles of a decagon are (4x + 100), (146 + x), (2x + 129), (3x + 130), (120 + x), (110 + 2x), (3x + 101), (4x + 81), (63 + 4x), and (3x + 109), what is the value of x? 

5. 
What is the sum of the measures of the interior angles of a hexagon?
    1080  
    720  
    900  
    360  
    1440  
    1350  


6. 
Polygon I has t sides. How many diagonals can be drawn inside of polygon I?
    t(t  2) ÷ 2  
    t(t  3) ÷ 2  
    2 (t  4)  
    2 (t)  
    t(t  2)  
    t(t  2) ÷ 3  


7. 
The measure of each interior angle in a polygon is 135. What is the name of the polygon?
    pentagon  
    hexagon  
    octagon  
    heptagon  
    quadrilateral  
    triangle  


8. 
Which of the following cannot represent the measure of an exterior angle of a regular polygon?
    60  
    20  
    72  
    40  
    49  
    45  

