Dilations Corresponding Sides

What is the scale factor if the triangle on the left is the original?

• 2

• 3/2

• 2/3

• 1/2

Which of the following are Dilations?

• (x, y) → (x, 3y)

• (x, y) → (3x, 3y)

• (x, y) → (x, y - 3)

• (x, y) → (.5x, .4y)

Does the image show a dilation?

• Yes

• No

A triangle has vertices with coordinates (2,0), (3, -1) and (-2,-5). If the triangle is dilated by a scale factor of 3 with the origin as the center of dilation, what are the coordinates of the vertices of the image?

• (5,3), (6,2), (1,-2)

• (6,0), (9,-3), (-6,-15)

• (2/3,0), (1,-1/3), (-2/3,-5/3)

• (-1,-3), (0,-4), (-5,-8)

PQRS is a scaled copy/dilation of ABCD. Which side length on PQRS corresponds to BC?

• Side PQ

• Side QR

• Side RS

• Side SP

PQRS is a scaled copy of ABCD. Which side length on PQRS corresponds to BC?

• Side PQ

• Side QR

• Side RS

• Side SP

a transformation that ​changes the size (enlargement or reduction) of a figure is called a ​ ​ ​ (a)  

• dilation

• rotation

• reflection

• translation

If the scale factor is greater than 1, the dilation is (a)  

• an enlargement

• a rotation

• a translation

• a reduction

Rectangle EFGH is dilated by a scale factor of 3. The origin (0,0) is the center of dilation. E(1,2); F(3,2); G(3,-1); H(1,-1). Which of these is the new, dilated rectangle?

Dilate the rectangle by a factor of 2.

• (6,6)

• C'

• (0,4)

• A'

• (4,8)

• B'

• (2,2)

• D'