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Geometry
Holt 6.1
Notes 3.1
Page 382
POLYGON:
Side:
Vertex:
Diagonal
Naming Polygons:
Diagonal:
# of sides
Name of Polygon
Polygons are named by ___________________________.
Tell whether the following figures are polygons. If so, identify
them.
A.
B.
______________
C.
_______________
_______________
D.
________________
Classifying Polygons:
Polygons that have all congruent sides are called
__________________. Polygons with all congruent angles are called _________________.
Polygons that are both are called_________________.
Example:
of a regular
polygon
All of the following figures are considered to be CONCAVE polygons….
These figures are considered to be CONVEX polygons….
What observations can you make? Using these examples, can you form a good definition of each?
Concave:
Convex:
Tell whether each polygon is regular or irregular....concave or convex.
A.
________________________
B.
_____________________
C.
______________________
Polygon Properties:
Recall: The interior angles of a triangle will always add to
What about polygons with MORE than three sides. What will their interior angles add up to?
Quadrilateral
# of
triangles_________
Pentagon
# of
triangles_________
Hexagon
# of
triangles_________
What do you notice about the number of sides a polygon has, vs. the number of triangles formed by drawing all
possible diagonals from one vertex? (Remember this for tomorrow!!!)
_________________________________________________________________________________