Question

name lawler - stapfigh
period 7 date 9/24/15
unit 1 test
remember to show your work!

1. which of the following transformations would not produce a shape congruent to the original?

a) translate 3 units to the left and 4 units down.
b) reflect over the y - axis.
c) dilate with a scale factor of 3.
d) rotate 180° counterclockwise around origin.

Explanation:

Step1: Recall transformation properties

Translation, reflection and rotation are rigid - motions. They preserve the size and shape of the figure, resulting in a congruent figure.

Step2: Analyze dilation

Dilation changes the size of a figure. When a figure is dilated with a scale factor other than 1, the resulting figure is similar but not congruent to the original figure. Here, the scale factor is 3.

Answer:

c) Dilate with a scale factor of 3.