Exploring Similarity and Transformations in Math 8

The video tutorial explores the concept of similarity in geometry, focusing on how similar figures are related through transformations such as dilation, reflection, translation, and rotation. It explains the properties of similar figures, emphasizing proportional sides and congruent angles. Through examples, the tutorial demonstrates how to determine similarity using transformations and side comparisons, including a detailed analysis using the Pythagorean theorem for trapezoids.

What is the primary characteristic of similar figures?

• They have the same size but different shapes.

• They have the same shape but different sizes.

• They have different shapes and sizes.

• They are always congruent.

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CCSS.HSG.CO.B.6

What does a scale factor between 0 and 1 indicate?

• An enlargement

• Congruence

• No change

• A reduction

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If the scale factor is exactly 1, what does it mean for the figure?

• The figure is reduced.

• The figure is distorted.

• The figure is enlarged.

• The figure remains unchanged.

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CCSS.8.G.A.3

What transformation involves flipping a figure across an axis?

• Translation

• Rotation

• Reflection

• Dilation

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How do you find the scale factor in a dilation?

• By adding the side lengths of the new and old figures.

• By subtracting the side lengths of the old figure from the new figure.

• By dividing the side lengths of the new figure by the side lengths of the old figure.

• By multiplying the side lengths of the old figure by the new figure.

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CCSS.8.G.A.3

What happens to the coordinates of a point when it is translated right by 2 units and down by 3 units?

• X increases by 2, Y increases by 3

• X decreases by 2, Y increases by 3

• X increases by 2, Y decreases by 3

• X decreases by 2, Y decreases by 3

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CCSS.8.G.A.3

CCSS.HSG.CO.A.5

What is the result of a 90-degree counterclockwise rotation on the coordinates of a point?

• The X coordinate remains the same, and the Y coordinate takes the opposite sign.

• The X and Y coordinates switch, and the new Y takes the opposite sign of the original X.

• The Y coordinate remains the same, and the X coordinate takes the opposite sign.

• The X and Y coordinates switch, and the new X takes the opposite sign of the original Y.

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CCSS.8.G.A.3

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What must be true for two figures to be considered similar?

• Their sides must be proportional, and their angles must be congruent.

• Their sides and angles must both be proportional.

• Their sides and angles must both be congruent.

• Their sides must be equal, and their angles must be proportional.

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CCSS.8.G.A.2

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How do you determine if two figures are similar using side lengths?

• By comparing the products of side lengths.

• By comparing the sum of the side lengths.

• By comparing the ratios of corresponding side lengths.

• By comparing the differences in side lengths.

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CCSS.HSG.SRT.A.2

What theorem is used to compare the diagonal sides of trapezoids?

• Similarity Theorem

• Congruence Theorem

• Pythagorean Theorem

• Triangle Inequality Theorem