1. L13-4 Notes: Two-Dimensional Figures
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
HW L13-4 pg 524 # odds
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.