Access Point #: MAFS.912.G-CO.4.AP.12aArchived Access Point

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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