Warm-up Wednesday April 2

1. Warm-upWednesday April 2 Tell me everything you know about Geometry! 

2. If you have homework questions on systems, I will answer those tomorrow. Keep your worksheet until then.

3. Lets START Geometry!! You will be viewing WebPages today on some very basic concepts for geometry. Take notes on things that “jump out” at you. You have seen this before so it should not be anything new. This might be your favorite thing that we have done so far in the class.

4. Examples of Isometry • The figure shows a translation, an isometry. An irregular polygon ABCDE is translated to A'B'C'D'E'.Notice that the distance between A and B is the same as the distance between their images A' and B'. Isometry? What is it? http://www.icoachmath.com/math_dictionary/Isometry.html Definition of Isometry An isometry is a transformation in which the original figure and its image are congruent. More about Isometry is invariant with respect to distance (the distance between any two points in the original figure is the same as the distance between their corresponding images in the transformed figure (image). Reflections, rotations, translations are isometries. Examples of Isometry The figure shows a translationAn irregular polygon ABCDE is translated to A'B'C'D'E'.Notice that the distance between A and B is the same as the distance between their images A' and B'.

5. Rigid Motion? https://edisk.fandm.edu/annalisa.crannell/hm/math/Rigid_Motion.html Rigid Motion: Any way of moving all the points in the plane such that a) the relative distance between points stays the same and b) the relative position of the points stays the same.

6. Reflections http://www.mathsisfun.com/geometry/reflection.html http://www.regentsprep.org/Regents/math/geometry/GT1/reflect.htm • Keywords to know • Pre-image • Image • Transformation • Isometry • Reflection

7. Classwork/homework Reflections worksheet