Exploring Reflections in Geometry

The video tutorial introduces the concept of reflections in mathematics, describing them as a type of transformation that involves flipping a figure over a line of symmetry on a coordinate plane. It explains the properties of reflections, including congruence, and provides real-world examples such as reflections in water and mirrors. The tutorial includes exercises to identify reflections and explains how to perform reflections over the x and y axes on a coordinate plane. The video concludes with a summary and encouragement for further practice.

What is a reflection in mathematical terms?

• A change in size

• A change in location by flipping over a line of symmetry

• A rotation around a point

• A slide in any direction

Tags

CCSS.8.G.A.3

CCSS.HSG.CO.A.5

Which of the following is true about a reflection?

• The image is distorted

• The image is congruent to the original

• The image is always smaller than the original

• The image is always larger than the original

Tags

CCSS.8.G.A.3

CCSS.HSG.CO.A.5

In the real world, what is an example of a reflection?

• A shadow on the ground

• A ball rolling down a hill

• A car moving forward

• A mountain's image in a lake

Tags

CCSS.8.G.A.3

CCSS.HSG.CO.A.5

What does it mean for two figures to be congruent?

• They have different sizes and shapes

• They have the same size and shape

• They have the same shape but different sizes

• They have the same size but different shapes

Tags

CCSS.8.G.A.2

How can you tell if a blue figure is a reflection of a green figure?

• The figures are different sizes

• The figures are congruent and flipped over a line of reflection

• The figures are rotated around a point

• The figures are translated in any direction

Tags

CCSS.8.G.A.3

CCSS.HSG.CO.A.5

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

• The x-coordinate changes sign

• The y-coordinate changes sign

• Both coordinates change sign

• Neither coordinate changes

Tags

CCSS.8.G.A.3

CCSS.HSG.CO.A.5

When reflecting a point over the y-axis, which coordinate remains the same?

• Neither coordinate

• Both coordinates

• The y-coordinate

• The x-coordinate

Tags

CCSS.8.G.A.3

CCSS.HSG.CO.A.5

If a point (3, 4) is reflected over the x-axis, what are the coordinates of the reflected point?

• (3, 4)

• (-3, -4)

• (-3, 4)

• (3, -4)

Tags

CCSS.8.G.A.3

CCSS.HSG.CO.A.5

If a point (-5, 2) is reflected over the y-axis, what are the coordinates of the reflected point?

• (5, 2)

• (-5, -2)

• (5, -2)

• (-5, 2)

Tags

CCSS.8.G.A.3

CCSS.HSG.CO.A.5

What is the result of reflecting a point (6, -3) over both the x-axis and y-axis?

• (6, 3)

• (6, -3)

• (-6, -3)

• (-6, 3)

Tags

CCSS.8.G.A.3