Dilation and Parallel Triangles

Which of the following is the definition of a DILATION?

•  A transformation that can change the size of a polygon but leaves the shape unchanged.
•  A change in the shape of a polygon but leaves the size unchanged.
• A transformation that changes the size of a shape.

Which of the following is NOT a property of Dilations?

• Dilations preserve angle measure.
• Dilations preserve betweenness.
• Dilations preserve orientation.
• Dilations preserve size.

Does the image show a dilation?

• Yes
• No

Does the image show a Dilation?

• Yes
• No

Square A is a Dilation of Square B. What is the scale factor of the squares?

• 1/7
• 4/5
• 5/4
• 7

Which of the following correctly transforms ∆JKL to ∆PQR.

• a reflection across the x-axis followed by a dilation, then a rotation of 90° counter clockwise.
• a reflection across the x-axis followed by a dilation, then a rotation of 90° clockwise.
• a reflection across the y-axis followed by a dilation, then a rotation of 90° counter clockwise.

Which of the following are Dilations?

• (x, y) → (x, 3y)
• (x, y) → (3x, 3y)
• (x, y) → (x, y - 3)
• (x, y) → (.5x, .4y)

In this figure, triangle JBW is similar to triangle QKA, which of the following is true?

• JW/JB = QA/KA
• JB/BW = QK/KA
• BW/JW = KQ/KA

 A dilation can produce a larger figure or a(n)______

• reduction
• enlargement
• scale factor
• center of dilation

A dilation can produce a smaller figure or a(n)______

• reduction
• enlargement
• scale factor
• center of dilation