4.1 & 4.2 Dilations Review

What is Dilation?

• Dilation means to enlarge or reduce
• Dilation means to reflect on something
• Dilation means to like something
• Dilation means to make something different by making it smaller

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

Does the image show a Dilation?

• Yes
• No

Tags

CCSS.8.G.A.4

CCSS.HSG.SRT.A.2

Does the image show a dilation?

• Yes
• No

Tags

CCSS.8.G.A.4

CCSS.HSG.SRT.A.2

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

• a reduction
• an enlargement
• a scale
• not proportional

Tags

CCSS.8.G.A.3

A scale factor of less than one means

• that the image will be larger than the pre-image.
• That the image will be the same as the pre-image.
• That you need to subtract that amount off  of each side.
• That the image will be a reduction of the pre-image.

Tags

CCSS.8.G.A.3

Which might be a scale factor for a ENLARGEMENT?

• 1/1
• 1/2
• 3/2
• 2/3

Tags

CCSS.8.G.A.3

A triangle has vertices with coordinates (2,0), (3, -1) and (-2,-5). If the triangle is dilated by a scale factor of 3 with the origin as the center of dilation, what are the coordinates of the vertices of the image?

• (5,3), (6,2), (1,-2)
• (6,0), (9,-3), (-6,-15)
• (2/3,0), (1,-1/3), (-2/3,-5/3)
• (-1,-3), (0,-4), (-5,-8)

Tags

CCSS.8.G.A.3

A figure has a vertices W(-2,4), and X(1,4). Find the coordinates of the figure after a dilation with a scale factor of 2.

• W'(-1,2), X'(0.5,2)

• W'(-4,8), X'(2,8)

• W'(0,6), X'(3,6)

• W'(-4,2), X'(-1,2)

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