L13-4 Notes:

1
Chapter 13

• L13-4 Notes
• Two-Dimensional Figures

2
Vocabulary

• In geometry, flat figures such as squares or
  rectangles are two-dimensional figures.
• A polygon is a simple, closed, two-dimensional
  figure formed by three or more sides.
• When all of the sides of a polygon are congruent
  and all of the angles are congruent, the polygon
  is a regular polygon.

3
Polygons
4
Identify the Polygon

• Identify the polygon. Then state if it is a
  regular polygon.

The polygon has 5 sides. So, it is a pentagon.
Since the sides and angles are congruent, it is a
regular polygon.
5
Triangles
6
Quadrilaterals
7
Analyze Two-Dimensional Figures

• Many aircraft display the American flag in the
  shape of a parallelogram to show motion. Identify
  and describe the similarities and the differences
  between a rectangle and a parallelogram.

                                                                                                               
These shapes are alike because they both have four sides, opposite sides parallel, and opposite sides congruent. They are different because a rectangle has four right angles and a parallelogram does not necessarily have four right angles.