Grade 8 Reflections Worksheets: Printable Practice with Answer Keys

📚 Topic Summary

In geometry, a reflection is a transformation that flips a figure over a line, called the line of reflection. The reflected image is the same size and shape as the original, but it's a mirror image. Think about looking in a mirror – that's a reflection! In Grade 8, we often work with reflections over the x-axis, y-axis, or other lines.

Reflections preserve the size and shape (congruence) of the figure. When reflecting over the x-axis, the x-coordinate stays the same, and the y-coordinate changes sign. When reflecting over the y-axis, the y-coordinate stays the same, and the x-coordinate changes sign. Let's practice!

🔤 Part A: Vocabulary

Match each term with its definition:

1. Reflection
2. Line of Reflection
3. Image
4. Pre-image
5. Coordinate Plane

Definitions:

1. The original figure before a transformation.
2. A plane formed by the intersection of a horizontal number line (x-axis) and a vertical number line (y-axis).
3. The transformation that creates a mirror image of a figure.
4. The line over which a figure is reflected.
5. The figure after a transformation.

Write the correct number next to the term:

• Reflection: ____
• Line of Reflection: ____
• Image: ____
• Pre-image: ____
• Coordinate Plane: ____

✍️ Part B: Fill in the Blanks

Complete the following paragraph with the correct words:

A ______ is a transformation that flips a figure over a ______. The resulting figure is called the ______. When reflecting over the x-axis, the ______ coordinate stays the same, and the ______ coordinate changes sign.

Possible words: reflection, line of reflection, image, x, y

🤔 Part C: Critical Thinking

Describe a real-world example of a reflection you see in your daily life and explain what the "line of reflection" is in that situation.

🔑 Answer Key

Part A: Vocabulary

• Reflection: 3
• Line of Reflection: 4
• Image: 5
• Pre-image: 1
• Coordinate Plane: 2

Part B: Fill in the Blanks

A reflection is a transformation that flips a figure over a line of reflection. The resulting figure is called the image. When reflecting over the x-axis, the x coordinate stays the same, and the y coordinate changes sign.

Part C: Critical Thinking

Answers will vary but should demonstrate understanding of reflections. Example: Looking at my reflection in a calm lake. The surface of the water acts as the line of reflection.