Math CC7/8 – Be Prepared On Desk: HW: p.21, #11 and #13 (WS – ACE) Pencil Protractor Math Journal BPW Learning Log Turn in HW: Extra Extra Symmetry Learning Log: HW: p.21, #11 and #13 (WS – ACE) Turn in TwMM books! Late! Parent Signatures-Test/LL?! Polyptych – due by Thurs. May 24th.

Tasks for Today Lesson 1.3– Translational Symmetry

JJ’ is parallel to LL’ (etc.) Labsheet 1.3 J’ K’ The connecting segments are the same length and are parallel to each other! GG’ = HH’ = KK’ (etc.) JJ’ is parallel to LL’ (etc.) H’ L’ M’ G’ All points move in straight lines and in the same direction

http://www.youtube.com/watch?v=6CCnJOxrZaY&hd=1

Translation When translating an object we need to remember to keep the same distance and keep the same angle. To keep the same angle, we must maintain parallel lines of translation. If given an arrow of translation, follow these 4 steps– Measure the distance and label the distance on the line. Keeping your ruler parallel to the original line, measure the same distance and plot the new point on the image. (label as prime!) Repeat steps for all remaining points. Connect all new points to create your translated image. Remember: Label all new points as PRIME! Each new point will be the SAME distance from the original and maintain the SAME angle as the original object.

All segments between points and their images are all the same length as the translation arrow and are parallel to it. Corresponding sides of the original polygon and its image are the same length and parallel. Corresponding angles are also the same measure.

ABB’A’ = Parallelogram Yes! If we find the midpoint (X) of AB and apply the same translation, then its image X’ will be on A’B’.