Homework Help: Math

Posted by Briana T on Thursday, December 6, 2012 at 4:08pm.

1.
Given a scale factor of 2, find the coordinates for the dilation of the line segment with endpoints (–1, 2) and (3, –3).

(2, 4) and (6, 6)
(2, 4) and (6, 6)
(–2, 4) and (6, –6)
(2, –1) and (–3, 3)

2.
Given a scale factor of one-half , find the coordinates for the dilation of the triangle with vertices at (0, 0), (0, 2), and (4, 0).

(0, 0), (0, 4), (8, 0)
(0, 0), (0, 1), (2, 0)
(one-half,one-half), (one-half, 1), (2, one-half)
(2, 2), (2, 4), (8, 2)

3.

The dashed figure is a dilation of the original figure. Find the scale factor. Classify the dilation as an enlargement or a reduction.

dashed figure dilation

2, enlargement
one-third , reduction
one-half , reduction
3, enlargement

4.
What is the scale factor in the following dilation? The red triangle is the pre-image.
dilation

3
one-third
2
one-half

My Answer Please Check Please
1 (2, 4) and (6, 6)
2 (2, 2), (2, 4), (8, 2)
3 2, enlargement
4 one-half

Math - Steve, Thursday, December 6, 2012 at 4:15pm
1. (C) don't lose track of the signs
2. (B) just multiply coordinates by scale factor
3,4. no diagrams here

I'd be interested to see how you arrived at your answers for 1 & 2.

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