How do you find the new area of a shape after dilation?

Square the scale factor used in the dilation. Then multiply the old area by the squared scale factor.

If a shape is dilated, how do you find the new perimeter?

You multiply the old perimeter by the scale factor used in the dilation.

A square is dilated by a scale factor of 4.3. Which statement is true? Options: The perimeter of the new square will be 18.49 times the perimeter of the old square., The perimeter of the new square will be 3 times the perimeter of the old square., The area of the new square will be 4.3 times the area of the old square., The area of the new square will be 18.49 times the area of the old square.

The area of the new square will be 18.49 times the area of the old square.

8.3A Similar Figures Flashcards

Student preview

15 questions

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1.

FLASHCARD QUESTION

Front

If the scale factor is greater than one, the new figure will be:

Back

an enlargement

2.

FLASHCARD QUESTION

Front

If the scale factor is greater than one, the new figure will be

Back

an enlargement

3.

FLASHCARD QUESTION

Front

Which proportion must be true? Options: F, G, H, J

Back

G

4.

FLASHCARD QUESTION

Front

Which proportion must be true? Options:

A

,

B

,

C

,

D

Back

C

5.

FLASHCARD QUESTION

Front

Solve for X

Back

X = 5

6.

FLASHCARD QUESTION

Front

Solve for X

Back

X = 36

7.

FLASHCARD QUESTION

Front

Solve for X

Back

X = 40

9.

FLASHCARD QUESTION

Front

Formula for scale factor

Back

$\frac{new}{old}$

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