Unit 3 Reteach Assignment Big Idea 2 (Scale Factor)

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The length of I'S' is units. The area of rectangle F'I'S'H' is square units. The scale factor from rectangle F'I'S'H' to rectangle FISH is .

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Triangle A is similar to Triangle B. What is the perimeter of B?

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The perimeter of Triangle B is units.

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The figures are similar. What is the perimeter of Figure EFGH?

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The perimeter is units.

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What is the scale factor? Reminder: SF = Scaled Copy/Original

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The scale factor is .

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What is the scale factor? Reminder: SF = Scaled Copy/Original

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The scale factor is .

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Look at this square:
If the side lengths are tripled, then which of the following statements about its perimeter will be true?

The new perimeter will be 9 times the old perimeter.

The new perimeter will be 3 times the old perimeter.

The new perimeter will be 2 times the old perimeter.

The new perimeter will be 1/3 times the old perimeter.

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Look at this rectangle:
If the dimensions are doubled, which of the following statements are true?

The ratio of the new area to the old area will be 4:1.

The ratio of the new area to the old area will be 3:1.

The ratio of the new area to the old area will be 2:1

The ratio of the new area to the old area will be 1/3:1.

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Which figures are scaled copies?

Scaled Copies
Not Scaled Copies

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The rug in Danielle’s room has an area of 32 sq. ft. Over break she made a similar rug for her tree house with an area of 8 sq. ft. What scale factor did she use to reduce the size of the rug?

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1/4

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1/2

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Desmond measured a soccer field and made a scale drawing. The scale he used was 1 centimeter = 9 meters. The actual width of the soccer field is 54 meters. How wide is the field in the drawing?

In the drawing, the width of the field is centimeters.

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The rectangles are similar. The length of the smaller rectangle is 3 units and the width of the smaller rectangle is 2 units.

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What must be the length and width of the scaled copy?

The length is units and the width is units.

Unit 3 Reteach Assignment Big Idea 2 (Scale Factor)

Look at this square:If the side lengths are tripled, then which of the following statements about its perimeter will be true?

Look at this rectangle:If the dimensions are doubled, which of the following statements are true?

Which figures are scaled copies?

The rug in Danielle’s room has an area of 32 sq. ft. Over break she made a similar rug for her tree house with an area of 8 sq. ft. What scale factor did she use to reduce the size of the rug?

Look at this square:If the side lengths are tripled, then which of the following statements about its perimeter will be true?

Look at this rectangle:If the dimensions are doubled, which of the following statements are true?

Which figures are scaled copies?

The rug in Danielle’s room has an area of 32 sq. ft. Over break she made a similar rug for her tree house with an area of 8 sq. ft. What scale factor did she use to reduce the size of the rug?

Look at this square:
If the side lengths are tripled, then which of the following statements about its perimeter will be true?

Look at this rectangle:
If the dimensions are doubled, which of the following statements are true?

Look at this square:
If the side lengths are tripled, then which of the following statements about its perimeter will be true?

Look at this rectangle:
If the dimensions are doubled, which of the following statements are true?