Reflection (Geometry)

Front

What is reflection in geometry?

Back

Reflection is a transformation that flips a figure over a line, creating a mirror image.

Tags

CCSS.8.G.A.3

CCSS.HSG.CO.A.5

Front

What is the line of reflection?

Back

The line of reflection is the line over which a figure is reflected, such as the x-axis or y-axis.

Tags

CCSS.8.G.A.3

CCSS.HSG.CO.A.5

Front

What happens to the coordinates of a point when it is reflected over the y-axis?

Back

The x-coordinate changes sign, while the y-coordinate remains the same. For example, (x, y) becomes (-x, y).

Tags

CCSS.8.G.A.3

CCSS.HSG.CO.A.5

Front

What happens to the coordinates of a point when it is reflected over the x-axis?

Back

The y-coordinate changes sign, while the x-coordinate remains the same. For example, (x, y) becomes (x, -y).

Tags

CCSS.8.G.A.3

CCSS.HSG.CO.A.5

Front

What is another name for reflection?

Back

Another name for reflection is 'flip'.

Tags

CCSS.8.G.A.3

CCSS.HSG.CO.A.5

Front

If point A is at (2, 3), what is its reflection over the y-axis?

Back

The reflection of point A (2, 3) over the y-axis is (-2, 3).

Tags

CCSS.8.G.A.3

CCSS.HSG.CO.A.5

Front

If point B is at (4, -1), what is its reflection over the x-axis?

Back

The reflection of point B (4, -1) over the x-axis is (4, 1).

Tags

CCSS.8.G.A.3

CCSS.HSG.CO.A.5

Front

What is the effect of reflecting a shape across the x-axis?

Back

The shape will appear flipped upside down.

Tags

CCSS.8.G.A.3

CCSS.HSG.CO.A.5

Front

What is the effect of reflecting a shape across the y-axis?

Back

The shape will appear flipped horizontally.

Tags

CCSS.8.G.A.3

CCSS.HSG.CO.A.5

Front

Which axis is horizontal: x-axis or y-axis?

Back

The x-axis is the horizontal axis.

Tags

CCSS.5.G.A.1