Page 98 - Math Course 2 (Book 2)

Transformations: Dilations

Dilations in the Coordinate Plane

COORDINATE GEOMETRY
Triangle ABC has vertices A(–1, 1), B(2, –2), and C(–1, –2). Find the image of ΔABC after a dilation centered
at the origin with a scale factor of 2. Sketch the preimage and the image.

A. B. C. D. None of the
above

Answer

MO. 9 - L6b

Scale Factor of a Dilation

Let’s Begin

Identify Scale Factor

Examples

Determine the scale factor used for the dilation image length
with center C. Determine whether the dilation scale factor = preimage length
is an enlargement, reduction, or congruence
transformation.
2 image length
=
6 preimage length

1
= Simplify.
3

Since the scale factor is less than 1, the dilation is
a reduction.

1
Answer ; reduction
3
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