Reflections

Front

What is a reflection in geometry?

Back

A reflection is when you flip or mirror an object across a line.

Tags

CCSS.8.G.A.3

CCSS.HSG.CO.A.5

Front

What is the result of a transformation called?

Back

The result of a transformation is called the image.

Tags

CCSS.HSG.CO.A.2

Front

If a point (x, y) is reflected over the y-axis, what is the new point?

Back

The new point will be (-x, y).

Tags

CCSS.8.G.A.3

CCSS.HSG.CO.A.5

Front

If a point (x, y) is reflected over the x-axis, what is the new point?

Back

The new point will be (x, -y).

Tags

CCSS.8.G.A.3

CCSS.HSG.CO.A.5

Front

What axis is the image reflected over if the coordinates change from (x, y) to (-x, y)?

Back

The image is reflected over the y-axis.

Tags

CCSS.8.G.A.3

CCSS.HSG.CO.A.5

Front

What axis is the image reflected over if the coordinates change from (x, y) to (x, -y)?

Back

The image is reflected over the x-axis.

Tags

CCSS.8.G.A.3

CCSS.HSG.CO.A.5

Front

What is the pre-image in a reflection?

Back

The pre-image is the original figure before the transformation.

Tags

CCSS.8.G.A.3

CCSS.HSG.CO.A.5

Front

In a reflection, what happens to the distances between points?

Back

The distances between points remain the same after a reflection.

Tags

CCSS.8.G.A.3

CCSS.HSG.CO.A.5

Front

If triangle ABC has vertices A(1, 2), B(3, 4), and C(5, 6), what are the coordinates of A' after reflecting over the y-axis?

Back

A'(-1, 2).

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 across which the figure is flipped.

Tags

CCSS.8.G.A.3

CCSS.HSG.CO.A.5