standard_description: Understand that a two-dimensional figure is congruent to another if the second can be obtained from the first by a sequence of rotations, reflections, and translations; given two congruent figures, describe a sequence that exhibits the congruence between them.
problem_activity: Problem 1
Watch
this video
(without sound). What properties of reflections are being used to reflect each point?
Problem 2
Refelect
$${\angle ABC }$$
over
$${\overleftrightarrow {DE}}$$
using constructions.
[IMG]
Problem 3
Find the line of reflection between the two figures.
[IMG]


aligns: no