Description of the Task
The task requires students to classify triangles according to angle and side properties.
Students use Geometer's Sketchpad to manipulate triangles to see that constructed triangles
have imposed restrictions whereas drawn triangles can be freely dragged to change properties.
Students will use mathematical language to describe geometric concepts as they explore,
manipulate, and hypothesize about the classifications of triangles.
Students will use geometry to find a hidden constellation in a group of "stars".
Overall Expectations
 6m64 identify, describe, compare, and classify geometric figures
 6m69 use mathematical language effectively to describe geometric concepts,
reasoning, and
investigations, and coordinate systems
Specific Expectations
 6m75 classify twodimensional shapes according to angle and side properties (e.g.,
acute,
isosceles)
 6m81 use a computer application to explore and extend geometric concepts
 6m82 use mathematical language to describe geometric ideas (e.g., obtuseangled
triangle,
triangular prism)
 6m84 discuss geometric concepts with peers and use mathematical language to explain
their
understanding of the concepts
 6m85 explain, make conjectures about, and articulate hypotheses about geometric
properties
and relationships
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Materials Needed
Geometer's Sketchpad needs to be installed on all computers.
Four files need to be saved on each computer
