Name ___________KEY______________
10.4 Classifying Polygons
Determine whether or not each image is a polygon. If yes, write “polygon”, if no, write “not a polygon.”
Give an explanation for your answer.
1.
polygon, enclosed shape with straight sides
2.
not a polygon, curved lines
3.
not a polygon, curved lines
4.
polygon, enclosed shape with straight sides
5.
not a polygon, sides overlap
6.
polygon, enclosed shape with straight sides
7.
not a polygon, sides overlap
Look at each image and name the type of polygon pictured.
8.
hexagon
9.
pentagon
10.
octagon
11.
quadrilateral or rectangle
12.
octagon
13.
quadrilateral or parallelogram
Name the number of diagonals in each polygon.
14.
2
15.
1
16.
3
Use the formula to find the sum of the interior angles of each polygon.
17. Hexagon
(6 - 2) x 180 = 720o
18. Nonagon
(9 - 2) x 180 = 1260o
19. Decagon
(10 - 2) x 180 = 1440o
20. Pentagon
(5 - 2) x 180 = 540o