Clarifications:
Essential Understandings
Concrete:
- When given a segment, use manipulatives (e.g., compass and straightedge, string, reflective devices, paper folding, dynamic geometric software, tracing paper, patty paper, etc.) to create another segment of equal length.
- Draw a line with a straightedge.
- Place a starting point on the line.
- Place the point of the compass on point A.
- Stretch the compass so that the pencil is exactly on B.
- Without changing the span of the compass, place the compass point on the starting point on the reference line and swing the pencil so that it crosses the reference line.
- Label the new line segment.
- Understand the following concepts and vocabulary: segment, reference line and endpoint.
- A segment is what you would ordinarily think of when you draw a line on a piece of paper. E.g., a segment is a piece of a line. It begins at one point on the line, and ends at another. These points are known as the endpoints of the segment.
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| Number: MAFS.912.G-CO.4.AP.12a | Category: Access Points |
| Date Adopted or Revised: 07/14 |
Cluster:
Make geometric constructions. (Geometry - Supporting Cluster) : Clusters should not be sorted from Major to Supporting and then taught in that order. To do so would strip the coherence of the mathematical ideas and miss the opportunity to enhance the major work of the grade with the supporting clusters. |