Dilations Part 1: What Do You Notice?

Topic:Dilation, Geometry, Geometric Transformations

Interact with the app below for a few minutes. Have fun exploring! (LARGE POINTS, the slider, and Lisa's pic are moveable.)

In the app above, Lisa's pic is said to be dilated about point A by a scale factor k. What does a dilation seem to do to Lisa's original pic? What can it do? Describe.

In the app below, use the line tool to construct and Then move A, B, and C around a bit. Move the slider as well. What seems to be true about the two lines?

Use the tool(s) of GeoGebra to prove your assertion is true. Then explain how what you did shows your claim is indeed true.

So when we dilate a line about a point (with a scale factor ) , its image is another line that __________ the original (pre-image) line.

Select all that apply

A
is parallel to
B
is perpendicular to
C
is neither parallel nor perpendicular to
D
lies on top of

Check my answer (3)

So when we dilate a line about a point with a scale factor , its image is another line that __________ the original (pre-image) line.

Select all that apply

A
is parallel to
B
is perpendicular to
C
is neither parallel nor perpendicular to
D
lies on top of

Check my answer (3)

Dilations Part 1: What Do You Notice?

Interact with the app below for a few minutes. Have fun exploring! (LARGE POINTS, the slider, and Lisa's pic are moveable.)

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