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Texas Instruments
9-12
15 Minutes
TI-Nspire™TI-Nspire™ CAS
3.0
In this activity, students will use matrices to perform dilations centered at the origin of triangles. Students will explore the effect of the scale factor on the size relationship between the preimage and image of a polygon.
In Problem 1, students will examine the coordinates of the preimage and image of a triangle and recall properties of vertices under dilation. Students will read notes on creating a dilation matrix and then use matrix multiplication to find the image vertices.