Illustrative Mathematics
Joining Two Midpoints of Sides of a Triangle
Without ever using the actual term, this exercise has the learner develop the key properties of the midsegment of a triangle. This task leads the class to discover a proof of similar triangles using the properties of parallel...
Texas Instruments
Texas Instruments: Triangle Midsegment Theorem
Students can use Cabri Jr. to discover that the midsegment of a triangle is parallel to the third side and half the length of the third side.
Texas Instruments
Texas Instruments: Midsegment of a Triangle
Students explore the properties of triangles formed by connecting the midpoints of two sides of a triangle, and examine the relationship between the two triangles. They study the Triangle Midsegment theorem. [Requires Adobe Reader.]