9.2 Reflections & Congruence
9.2 Reflections & Congruence
A reflection is a transformation that flips a figure across a line. The line is called the line of reflection.
Task 1: Reflection across the x-axis
Answer the questions in your notebook for TASK 1 before moving on to the next task.
Task 2: Reflection across the y-axis
Answer the questions in your notebook for TASK 2 before moving on to the next task.
TASK 3: Reflections & Congruence
Trapezoid ABCD (preimage) has been reflected across the y-axis to Trapezoid A'B'C'D' (image).
1. Begin by selecting point A, B, C, or D(blue) and moving its location. Observe what happens to the side lengths and angles.
2. Move the remaining points until you have a new trapezoid where you can read all the angle measures and side lengths. Recall: A trapezoid has 1 pair of parallel sides.
3. Record all the angle measure and side lengths in your notebook.
4. Answer the questions in your notebook before moving on to the next task.
Answer the remaining questions for TASK 3 in your notebook.