"No Bending, No stretching"

1.7 No Bending or StretchingUNIT 1 • LESSON 7 NO BENDING OR STRETCHINGWHAT YOU WILL LEARNIn this lesson, I will compare measurements before and after translations, rotations, and reflections.I can...
  • Introduce the term rigid transformations.
  • Observe that rigid transformations preserve lengths and angle measures.
I will know I learned by...
  • Demonstrating that I can describe the effects of a rigid transformation on the lengths and angles in a polygon.
  KEY VOCABULARYCorresponding - If a part of the original figure matches up with a part of the copy, we call them corresponding parts. The part could be an angle, point, or side, and you can have corresponding angles, corresponding points, or corresponding sides. If you have a distance between two points in the original figure, then the distance between the corresponding points in the copy is called the corresponding distance.Rigid Transformation - A rigid transformation is a sequence of translations, rotations, and reflections. If a rigid transformation is applied to a geometric figure, the resulting figure is called the image of the original figure under the transformation. The diagram shows a rigid transformation consisting of a translation (from A to B) followed by a rotation (from B to C) followed by a reflection (from C to D). The last triangle is the image of the first triangle under this rigid transformation. FAMILY MATERIALS:To review or build a deeper understanding of the math concepts, skills, and practices in this lesson, visit the Family Materials provided by Illustrative Mathematics Open-Up Resources. (Links to an external site.)Links to an external site.