1. All sides have the same length and angles have the same measure.
A closed plane figure whose sides are segments that intersect only at their endpoints.
Polygons:
Regular Polygon:
Convex: Concave:
All sides have the same length and angles have the same measure.
REGULAR
TRIANGLE
REGULAR
QUADRILATERAL
REGULAR
PENTAGON
REGULAR
HEXAGON
A polygon is convex if a segment joining any two interior points lies completely within the polygon
A polygon that is not convex

2. and tell whether it is convex or concave. If not, explain why.
Directions: Tell whether the figure is a polygon. If it is a polygon, classify it
and tell whether it is convex or concave. If not, explain why.
Polygons
# of Sides

3. A polygon with four sides
Quadrilaterals:
Some quadrilaterals have special names based on whether they have
parallel or congruent sides and whether they have right angles.
Name:
Sides:
Angles:
A polygon with four sides
TRAPEZOID
PARALLELOGRAM
RHOMBUS
RECTANGLE
SQUARE
Exactly one pair of parallel sides
Both pair of opposite sides are parallel
Four congruent sides
Four congruent sides
Four right angles
Four right angles

4. A segment that joins two vertices that are not adjacent
Diagonal of a polygon:
To find the sum of the interior angles of a polygon, you can
cut up the polygon into ____________ using ______________.
The sum of the interior angles of a triangle is:
1. Find the measures of the interior angles on each of the regular polygons.
2. Find the value of x.
A segment that joins two vertices that are not adjacent
TRIANGLES
DIAGONALS
Multiply by the number of triangles
Divide by the number of angles to find each angle measure