Reflection

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 across the x-axis?

Back

The y-coordinate of the point changes sign, while the x-coordinate remains the same.

Tags

CCSS.8.G.A.3

CCSS.HSG.CO.A.5

Front

If point A(3, 4) is reflected across the x-axis, what are the coordinates of A'?

Back

A' will be (3, -4).

Tags

CCSS.8.G.A.3

CCSS.HSG.CO.A.5

Front

If point B(2, -5) is reflected across the y-axis, what are the coordinates of B'?

Back

B' will be (-2, -5).

Tags

CCSS.8.G.A.3

CCSS.HSG.CO.A.5

Front

What is the result of reflecting a point on the x-axis?

Back

The result is that the point's y-coordinate becomes negative.

Tags

CCSS.8.G.A.3

CCSS.HSG.CO.A.5

Front

If a triangle has vertices at A(1, 2), B(3, 4), and C(5, 6), what are the coordinates after reflecting across the x-axis?

Back

A'(1, -2), B'(3, -4), C'(5, -6).

Tags

CCSS.8.G.A.3

CCSS.HSG.CO.A.5

Front

What is the difference between reflection and rotation?

Back

Reflection flips a figure over a line, while rotation turns a figure around a point.

Tags

CCSS.8.G.A.3

CCSS.HSG.CO.A.5

Front

If a figure is reflected across the y-axis, how does the x-coordinate change?

Back

The x-coordinate changes sign, while the y-coordinate remains the same.

Tags

CCSS.8.G.A.3

CCSS.HSG.CO.A.5

Front

What is the reflection of the point P(-3, 2) across the y-axis?

Back

The reflection P' will be (3, 2).

Tags

CCSS.8.G.A.3

CCSS.HSG.CO.A.5