Dilation and 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 of 2.

• B' (2 , 4.5)

• B' (-8 ,-18)

• B' (8 ,18)

• B' (9 ,4)

When A(3, 6) is under a dilation of 2 what are the coordinates of A'?

• (3, 6)

• (1.5, 3)

• (6, 12)

• (12, 6)

When a dilation has a scale factor greater than one, the dilation is an enlargement.

• True

• False

When the scale factor of a dilation is less than one, the dilation is a reduction.

• True

• False

Which of the following is the algebraic representation for a dilation?

• (x, y) → (x, 3y)

• (x, y) → (3x, 3y)

• (x, y) → (x, y - 3)

• (x, y) → (.5x, .4y)

The __________ is the ratio of a length of the new figure to the corresponding length on the original figure.

• reduction

• enlargement

• scale factor

• center of dilation

If your SF = 0.8, what type of dilation is it?

• Reduction

• Enlargement

If your SF = 2.5, what type of dilation is it?

• Reduction

• Enlargement

If your SF = 6/5, what type of dilation is it?

• Reduction

• Enlargement

If your SF = 7/7, what happens to the figure when dilated?

• reduced

• enlarge

• preserve

• It turns into an octopus