The coordinate plane is an important tool to help you navigate and keep track of the locations of objects.

Coordinates are pairs of numbers that describe the exact locations of points in the coordinate plane.

A reflection in the coordinate plane is a transformation that creates a mirror image of the original figure.

Mathagon

Definition

Reflect over a Horizontal or Vertical Line

Reflect over the x or y-axis

Reflect over a 45-Degree Diagonal Line

Reflections in the Coordinate Plane

A reflection in the coordinate plane is a transformation that creates a mirror image of the original figure. See what reflections look like in this video.

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What Is a Reflection in the Coordinate Plane?

A polygon can be reflected over a horizontal or vertical line by reflecting one vertex at a time. This video explains how, and gives some examples.

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How Do You Reflect a Polygon over a Horizontal or Vertical Line?

You can perform reflections over the x or y-axis by just changing the sign of one of the coordinates. See why you can, and how by watching this video.

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How Do You Reflect a Polygon over the x or y-axis?

By reflecting one vertex at a time, you can reflect an entire polygon over a diagonal line. The method on how to do this, and examples are shown in this video.

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