Exploring Line Symmetry and Reflections

The video tutorial covers the concepts of line symmetry and reflection in geometry. It begins by explaining line symmetry using shapes like rectangles and stars, highlighting how lines can divide shapes into identical halves. The tutorial then demonstrates how to reflect a triangle over the x-axis, showing how the y-coordinates change while x-coordinates remain constant. Finally, it explains reflection over the y-axis, where x-coordinates change while y-coordinates stay the same. The tutorial uses clear examples and coordinates to illustrate these geometric transformations.

How many lines of symmetry does a rectangle have?

• 4

• 2

• 3

• 1

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CCSS.4.G.A.3

How many lines of symmetry does a star have?

• 5

• 10

• 2

• 6

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CCSS.4.G.A.3

What happens to the y-coordinate when a point is reflected over the x-axis?

• It becomes zero

• It is doubled

• It remains the same

• It is multiplied by -1

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CCSS.8.G.A.3

CCSS.HSG.CO.A.5

After reflecting over the x-axis, what is the new y-coordinate of point C if its original coordinate was (2,1)?

• (2,0)

• (2,-1)

• (0,1)

• (2,1)

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CCSS.8.G.A.3

CCSS.HSG.CO.A.5

If a shape is reflected over the x-axis, which of the following is true about the x-coordinates?

• They become zero

• They become negative

• They are unchanged

• They are doubled

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CCSS.8.G.A.3

CCSS.HSG.CO.A.5

Which of the following best describes the effect of reflection over the x-axis on the coordinates?

• Both coordinates become negative

• Coordinates remain unchanged

• y becomes negative, x remains the same

• x becomes negative, y remains the same

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CCSS.8.G.A.3

CCSS.HSG.CO.A.5

What transformation occurs to the coordinates when reflecting over the y-axis?

• x becomes -x, y remains the same

• y becomes -y, x remains the same

• No change occurs

• Both x and y become negative

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CCSS.8.G.A.3

CCSS.HSG.CO.A.5

What is the new x-coordinate of point A after reflection over the y-axis if its original coordinate was (4,6)?

• (-4,-6)

• (4,-6)

• (-4,6)

• (4,6)

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CCSS.8.G.A.3

CCSS.HSG.CO.A.5

What notation is used to indicate that a point has undergone two transformations?

• Prime (')

• Double prime ('')

• Asterisk (*)

• Caret (^)

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CCSS.HSG.CO.A.2

What is the correct transformation of point B's coordinates from (9,3) after reflecting over the y-axis?

• (9,-3)

• (-9,3)

• (9,3)

• (-9,-3)

Tags

CCSS.8.G.A.3

CCSS.HSG.CO.A.5