Dilations of Triangles

Triangle ABC will be dilated by a scale factor of 1/2.  What will be the coordinates of C'?

• (-1, -2.5)

• (12, 6)

• (3, -1.5)

• (0, 1.5)

Enlargement or reduction? Find the scale factor! Remember: It Goes from A -> A'

• It's an enlargement; the scale factor is 1/2.

• It's an enlargement; the scale factor is 2.

• It's a reduction; the scale factor is 1/2.

• It's a reduction; the scale factor is 2.

The algebraic expression for an enlargement by a scale factor of 3 is...

• (x, y)→(3x, 3y)

• (x, y)→(3, 3)

• (3x, y)→(x, y)

• (x, y)→(3x)

If the scale factor is greater than 1, the dilation is...

• an enlargement

• a rotation

• a translation

• a reduction

• ∠Y is congruent to ∠L
•  ML corresponds to ZY
• KM/ML = XZ/ZY
• ∠M corresponds to ∠X

• A

• B

• C

• D

A triangle has vertices with coordinates A(2,0), B(3, -1) and C(-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 C'?

• (1,-2)

• (-6,-15)

• (-2/3,-5/3)

• (-5,-8)

Choose the correct scale factor:

• 2.5

• 1.5

• 3.5

• 4

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

• 1/2

• 7/3

• 2/1

• 10/3

What is the scale factor of the dilation of ABC to XYZ?

• 2

• 3