Angle Representer
Sub Trajectory: parts

Represents various angle contexts as two lines, explicitly including the reference line (horizontal or vertical for slope; a “line of sight” for turn contexts) and, at least implicitly, the size of the angle as the rotation between these lines (may still maintain misconceptions about angle measure, such as relating angle size to the length of side’s distance between endpoints, and may not apply these understandings to multiple contexts).

Activities

You may see this:

Linked Image to Sign In/Sign Up page

Other Examples:

  • Children identify the measure of an angle by using plastic straws.
  • Children draw the angle under a ramp they have built (from the floor under the ramp to the bottom of the ramp) and a wider angle over the ramp (from the floor in front of the ramp to the top of the ramp). 

Help your student become a(n) Angle Representer

Activities and experiences throughout the day challenge children to understand the many contexts that involve all the attributes of angles. That is, angles have two rays, and so children can explicitly include the reference line (horizontal or vertical for slope; a “line of sight” for turning such as along a road) and the size of the angle as the rotation between these lines.

Special Thanks To

Institute of Education Sciences
The research reported here was supported by the Institute of Education Sciences, U.S. Department of Education, through grant numbers R305K050157, R305A120813, R305A110188, and R305A150243. to the University of Denver. The opinions expressed are those of the authors and do not represent views of the Institute or the U.S. Department of Education.