Dilations

Tell whether each transformation is a dilation. Explain.

• No, scale factor isn't the same.

• Yes, scale factor is the same

A dilation with a scale factor k>1 is called what?

a dilation with a scale factor 0<k<1 is called what?

Identify the type of dilation for the scale factor k=1/2.

• Reduction

• Enlargement

• Isometry

• None of these

Identify the type of dilation given the scale factor k=5/4

• Reduction

• Enlargement

• Isometry

• None of these

Triangle ABC has vertices at A(2,3) B(-5,-1) C(0,5). Its image, Triangle A'B'C', has vertices at A'(4,6) B'(-10,-2) and C'(0,10). What is the scale factor?

State the coordinate of the image of the given point B (4,9) under a dilation with center at the origin with the given scale factor k = 2.

• (2,4.5)

• (-8,-18)

• (8,18)

• (9,4)

If the scale factor of dilation is 3, will the image be larger or smaller than the original figure?

• larger

• smaller

If the scale factor of dilation is 1/3, will the image be larger or smaller than the original figure?

• larger

• smaller

If the point A(-5, 4) is dilated by a scale factor of 2, what are the coordinates of the image point, A'?

• (-10, 8)

• (10, 8)

• (-3, 6)

• (-7, 6)