McGraw Hill Integrated II, 2012
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McGraw Hill Integrated II, 2012 View details
8. Dilations
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Exercise 12 Page 697

Begin by drawing rays from S through each vertex.

Practice makes perfect

To draw the image of a figure under a dilation with center S and the scale factor k, we need to follow a few steps.

  • Step 1: Draw rays from S through each vertex.
  • Step 2: Choose one vertex, which we will arbitrarily call A. Locate A' on SA such that SA' = k SA.
  • Step 3: Repeat Step 2 for the remaining vertices. Then connect the new vertices to create the image.
Let's draw the dilation of the given figure!

Step 1

We will begin by drawing the rays from S through each vertex. Let's also name the remaining vertices A, B, C, and D.

Step 2

The given scale factor is k= 13. Let's locate A' on SA such that SA' = 13 SA. To do this, we measure SA first. Then, after multiplying SA by 13, we get the length of SA'. We locate point A' by measuring this length from S along SA.

Step 3

We can locate B' on SB, C' on SC, and D' on SD in the same way we located A' in Step 2.

Finally, we can connect the new vertices and get the image of the original figure.