Reflections, Transformations, Dilations

Rotations, like translations and reflections, produce congruent figures.

• true

• false

We've talked about and practiced 3 out of the 4 transformations. They are:

• dilations, translations, and reflections

• reflections, rotations, and dilations

• translations, reflections, and rotations

• rotations, dilations, and translations

What do translations, reflections, and rotations have in common?

• they all produce congruent figures

• they all slide a figure on a coordinate plane

• they all produce mirror like images on a coordinate plane

• they all turn a figure on a coordinate plane

A square has sides of 6 inches and is dilated to form a square that has sides of 24. What is the scale factor?

• 1/4 because 6/24 = 1/4

• 4 because 24/6 = 4

• 30 because 24 + 6 = 30

• No way to know with this information.

A rectangle has an area of 30 cm². The rectangle is dilated with a scale factor of 3. What is the area of the new rectangle?

• 30 cm²

• 90 cm²

• 270 cm²

• impossible to know

Which is an example of the algebraic rule for a DILATION?

• (3x, 3y)

• (x+3, y-2)

• (-x, -y)

• (y, -x)

Which algrebraic rule shows a REFLECTION across the x-axis?

• (x, -y)

• (-x, y)

• (4x, 4y)

• (y, -x)

Which transformation does NOT preserve congruence?

• transformation

• reflection

• rotation

• dilation

A translation moves a figure 3 units to the left. Which would describe this move?

• x - 3

• x + 3

• y - 3

• y + 3

Which of the following could be a dilation?

• (6x, 6y)

• (x + 1, y - 5)

• (x, -y)

• (-x, -y)