Warm up was to reflect triangles across y=x and a horizontal line. Went over homework, then learned the rules for rotations 90°, 180°, and 270° counterclockwise around the origin. Worked through several examples of rotations in class.
Notes from class
blank copy of in-class rotations practice
Homework
#1-12 on this new handout (ANSWERS)
assessment is next class: study the last 2 hw handouts, your notes, and especially the rotation and reflection rules
Resources
identifying type of rotation, developing coordinate rules: link
drawing figures based on rotations, using coordinate rules: link
alternate way of drawing rotations, not using rules: link
performing a reflection across non-axis lines (made by me!) link
identifying the line of reflection (made by me!) link
translating a figure on the coordinate plane: link
reflecting a figure across x or y axis: link
reflecting across various lines: link
basics of translation link
write a rule for a translation: link
Practiced in our warm up with rotations and describing transformations, then took assessment, and finally played TRANSFORMATION GOLF
Homework
watch and take notes on this video: link
Warm up was sequencing transformations like in the video above. Passed back tests, then went over how to rotate figures on the coordinate plane when the center is not the origin. Worked through a few examples. Then returned to the Euclidean plane and sequenced some more transformations to verify congruence, noting the order of the names of the figures (corresponding parts must match) and how much and what kind of detail is needed to describe translations, rotations, and reflections. Used patty paper to help visualize these motions. Passed out hw handout.
Notes from board
Homework
work on this handout due Tuesday (A) or Wednesday (B)
next assessment is Thursday (A) or Friday (B)
Resources
rotations without using rules (video uses origin, but we did not) link
rotation around non-origin point using rules: link
rotational symmetry and angle of rotation: link
identifying symmetry: link
making symmetry: link
rotation around a fixed point which doesn't move: link
describing a series of rigid motions to carry one figure onto another: link
identifying translation vectors: link
reflecting a figure on the coordinate plane link (made by me!)
identifying the line of reflection link (made by me again!)