Area and Dilations

If a shape is dilated by a scale factor of one-half, what is the resulting perimeter? 

• The same as the perimeter of the preimage

• The new perimeter is bigger than the preimage

• The new perimeter is smaller than the preimage

• The new perimeter is 4 times the original

Triangle ABC is dilated using a scale factor of 1/2. What are the new coordinates of point A'?

• (-3, 3)

• (-12, 12)

• (-2, 2)

Square A is a Dilation of Square B. What is the scale factor of the squares?

• 1/7

• 4/5

• 5/4

• 7

Figure ABCD has an area of 4 units². It is then dilated using a scale factor of 4. What is the perimeter of the new figure?

• 32

• 64

• 8

Which of the following is the definition of a DILATION?

•  A transformation that can change the size of a polygon but leaves the shape unchanged.

•  A change in the shape of a polygon but leaves the size unchanged.

• A transformation that changes the size of a shape.

Every dilation has a fixed point called the_________

• reduction

• enlargement

• scale factor

• center of dilation 

The red triangle has been dilated by a scale factor of 1/4, which triangle is it's new image? 

• green triangle 

• red triangle 

• black triangle

• none of these 

Dilate Point B by a scale factor of 1/2

• (1.5,-4)

• (-1.5,1)

• (-1,-1.5)

• (-2,-2)

What is the scale factor from triangle ABC to triangle DEF?

• 1/2

• 7/3

• 2/1

• 10/3

If the scale factor is 4, what is the measurement of x?

• 20 m

• 24 m

• 16 m

• 4 m