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Mathematics |

Posted Wed Dec 1 07:59:32 PST 1999 by Mark Blackburn (mblackburn@floyd.k12.ky.us).

Betsy Layne High School, Betsy Layne, USA

Materials Required: Tangrams, computer, Geometer's Sketchpad, a performance event

Concepts Taught: Geometry/measurement

Core Content Are:

Geometry/measurement

Stufdents will:

*Develop a definition of a triangle

*Identify the parts of a triangle

*Claify triangles by their parts

Embedded Core Content:

Mathematical structure

Opening Activity

In your own words, what is a triangle? What relationship does a triangle have with a square? A hexagon? An octagon?

Teacher directions

This leson can be taught in groups or individually. The major limitation to the lesson is the amount of computers and tangrams are avilable for class.

Student directions

Students will use the tangrams to build or choose the appropriate triangle being discussed. The ywill use the definitions to find the triangle in question. In groups, the students will construct triangles on Geometer's Sketchpad and other students will classify the triangles an identify the parts of the constructed triangles.

Closing activity

Students will review the main ideas discussed in the lesson.

Assignment

In your environment, find twenty triangles, draw the triangles as you seethem and classify the triangles according to their attributes (SIDE AND ANGLE).