dilations review

how could we try to find the center of dilation?

• Connect K to N, J to M and LO

• measure the ratio of KJ to NM

• Connect K to N, J to M and LO and extend the lines until they intersect

• Find the midpointsof MN and NO, connect them

every dilation has a ...

• scale factor

• center of dilation

• A and B

• center of rotation

If two shapes are a result of a dilation, they are...

• similar

• congruent

• different shapes

• don't share angles

a triangle and its dilation always have (pick all the apply)

• congruent sides

• congruent angles

• proportional sides

• some sides proportional but not all

• at least one congruent angle

Choose the correct scale factor:

• 2
• 3
• 1/3
• 1/2

Find missing side

• 5
• 7
• 9
• 11

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

If a line divides two sides of a triangle proportionally, the line must be ___________ to the third side of the triangle.

 Solve.

• 60
• 24
• 16
• 12

(x, y) -> (2x, 2y)

What does the coefficient 2 mean?

• move points 2 units to the right and 2 units up

• scale factor is 2, creating a new figure half the size of the original

• scale factor is 2, making a figure twice the size of the original

• rotate the figure 2 quadrants