Geometry Dilation Vocabulary

The original figure of a geometric figure is called a...

• Image

• Pre-image

• Shape

• None of the above

After the transformation, the figure is called the...

• Pre-image

• After-image

• Image

• Shape

If the pre-image and the image have the same size and shape, then they are...

• Congruent 

• Similiar

• Different

What transformation changes the size, but not the shape of a figure?

• Translation

• Orientation

• Dilation

• Rotation

The red triangle has been dilated by a scale factor of 1/4 about the origin, which triangle is it's new image?

• green triangle 

• red triangle 

• black triangle

• none of these 

Does the image show a Dilation? If yes, did the image enlarge, reduce or none of the above?

• Yes, enlarge

• Yes, reduce

• No

The dark letter F was dilated from the centre point (-5, 0) by the factor ...

• -2

• -0.5

• 0.5

• 2

Rectangle ABCD is dilated so that the coordinates of C' are (2, -1).  What could be the dilation rule?

• (-2x, +1y)

• (1/2 x, 1/2 y)

• (2x, 2y)

• (x - 2, y - 1)

Dilation:

Size of Figure: ​ ​ ​ (a)  

Orientation of Figure: ​ ​ ​ (b)  

Orientation of Vertices: ​ ​ (c)  

• Changed

• Same

Dilate Point B by a scale factor of 1/2

• (1.5,-4)

• (-1.5,1)

• (-1,-1.5)

• (-2,-2)