8.3 - Dilations of Lines

True or False:
When a figure is dilated, the pre-image and image are congruent.

• True
• False

Tags

CCSS.8.G.A.3

True or False:
When the center of dilation is on the line being dilated, the new line is the same as the original.

• True
• False

Tags

CCSS.8.G.A.3

A dilation is which of the following: 

• An enlargement
• A reduction
• Either an enlargement or a reduction
• Neither an enlargement or a reduction

Tags

CCSS.8.G.A.3

State the coordinate of the image of the given point B (-10,-6) under a dilation with center at the origin with the given scale factor k = 1/2.

• (5,3)
• (20,12)
• (-20,-12)
• (-5,-3)

Tags

CCSS.8.G.A.3

In a dilation what mathematical operation is used with the scale factor?

• addition 
• subtraction 
• multiplication 
• division 

Tags

CCSS.8.G.A.3

The center of dilation is important because

• it's the location from which the dilation occurs.

• All of the corresponding points of the image and pre image are on the lines radiating from the Center of Dilation.

• it's a fixed point on the plane about which all points are expanded or contracted.

• All of the above

Tags

CCSS.8.G.A.3

If the scale factor is less than one, the new figure will be

• an enlargement
• a reduction
• a scale factor
• bigger

Tags

CCSS.8.G.A.3

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

• True
• False

Tags

CCSS.8.G.A.3

What happens to a line segment that passes through the point of dilation is dilated by a number less than 1?

• It gets shorter.

• It gets longer and moves further from the point of dilation, but parallel to the original image.

• It gets shorter and moves closer to the point of dilation, but parallel to the original image.

• It gets longer.

What happens to a line segment that doesn't pass through the point of dilation when it is dilated by a number greater than 1?

• It gets shorter or longer.

• It gets longer and moves further from the point of dilation, but parallel to the original image.

• It gets shorter and moves closer to the point of dilation, but parallel to the original image.

• It moves but stays the same size.