| Curriculum Framework 2009 |
| Understanding the Standard || Essential Understandings || Essential Knowledge and Skills |
A polygon is a closed plane figure composed of at least three line segments that do not cross.None of the sides are curved.
Perimeter is a measure of the distance around a polygon and is found by adding the measures of the sides.
Area is the number of iterations of a two-dimensional unit needed to cover a surface.The two-dimensional unit is usually a square, but it could also be another shape such as a rectangle or an equilateral triangle.
- Opportunities to explore the concepts of perimeter and area should involve hands-on experiences (e.g., placing tiles (units) around a polygon and counting the number of tiles to determine its perimeter and filling or covering a polygon with cubes (square units) and counting the cubes to determine its area).
All students should
Understand the meaning of a polygon as a closed figure with at least three sides.None of the sides are curved and there are no intersecting lines.
Understand that perimeter is a measure of the distance around a polygon.
Understand how to determine the perimeter by counting the number of units around a polygon.
Understand that area is a measure of square units needed to cover a surface.
Understand how to determine the area by counting the number of square units.
The student will use problem solving, mathematical communication, mathematical reasoning, connections, and representations to
·Measure each side of a variety of polygons and add the measures of the sides to determine the perimeter of each polygon.
·Determine the area of a given surface by estimating and then counting the number of square units needed to cover the surface.