Geometry Dilation

If a dilation has a scale factor greater than 1, what can be said about the dilated figure?

• The dilated figure is smaller than the original.

• The dilated figure is larger than the original.

• The dilated figure is the same size as the original.

• The dilated figure is a reflection of the original.

Tags

CCSS.8.G.A.3

If a dilation has a scale factor less than 1, what can be said about the dilated figure?

• The dilated figure is smaller than the original.

• The dilated figure is larger than the original.

• The dilated figure is the same size as the original.

• The dilated figure is a reflection of the original.

Tags

CCSS.8.G.A.3

SHADOW PUPPET: You can use a flashlight and a shadow puppet (your hands) to project shadows on the wall.

Identify the type of dilation.

What does the flashlight represent?

The length of the ears on the shadow puppet is 3 inches. The length of the ears on the shadow is 4 inches. What is the scale factor?

Describe what happens as the shadow puppet moves closer to the flashlight. How does this affect the scale factor?

Tags

CCSS.8.G.A.3

A balloon is initially 10 cm in diameter. After dilation, its diameter becomes 25 cm. What is the scale factor of the dilation?

• • 1.5

• 2.5

• 3

• 2

Tags

CCSS.8.G.A.3

What is the definition of dilation in geometry?

• A transformation that preserves angles and changes the size of a figure.

• A transformation that changes the shape and size of a figure.

• A transformation that only changes the position of a figure.

• A transformation that reflects a figure over a line.

Tags

CCSS.8.G.A.3

Tags

CCSS.8.G.A.3

Tags

CCSS.8.G.A.3

Tags

CCSS.8.G.A.3

What happens to the angles of a figure when it is dilated?

• The angles become larger.

• The angles become smaller.

• The angles remain the same.

• The angles are doubled.

Tags

CCSS.8.G.A.3

Tags

CCSS.8.G.A.3