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Triangle [tex]$ABC$[/tex] with vertices [tex]$A(2,4)$[/tex], [tex][tex]$B(4,0)$[/tex][/tex], and [tex]$C(6,6)$[/tex] is dilated about the origin to be triangle [tex]$A'B'C'$[/tex].

Which statement is true?
A. Triangle [tex][tex]$ABC$[/tex][/tex] is dilated by a scale factor of 0.5.
B. Triangle [tex]$ABC$[/tex] is dilated by a scale factor of 1.5.
C. Triangle [tex]$ABC$[/tex] is dilated by a scale factor of 2.
D. Triangle [tex][tex]$ABC$[/tex][/tex] is dilated by a scale factor of 2.5.


Sagot :

To determine which statement is true about the dilation of triangle [tex]\( ABC \)[/tex] to triangle [tex]\( A'B'C' \)[/tex], we need to find the correct scale factor that transforms the coordinates [tex]\( A(2,4) \)[/tex], [tex]\( B(4,0) \)[/tex], and [tex]\( C(6,6) \)[/tex].

We can find the dilated coordinates [tex]\( A'(x', y') \)[/tex], [tex]\( B'(x', y') \)[/tex], and [tex]\( C'(x', y') \)[/tex] using different scale factors and compare them to the original vertices.

Let's try each given scale factor and see which one accurately scales the triangle [tex]\( ABC \)[/tex].

1. Scale factor of 0.5:
- [tex]\( A'(2 \times 0.5, 4 \times 0.5) = (1, 2) \)[/tex]
- [tex]\( B'(4 \times 0.5, 0 \times 0.5) = (2, 0) \)[/tex]
- [tex]\( C'(6 \times 0.5, 6 \times 0.5) = (3, 3) \)[/tex]

2. Scale factor of 1.5:
- [tex]\( A'(2 \times 1.5, 4 \times 1.5) = (3, 6) \)[/tex]
- [tex]\( B'(4 \times 1.5, 0 \times 1.5) = (6, 0) \)[/tex]
- [tex]\( C'(6 \times 1.5, 6 \times 1.5) = (9, 9) \)[/tex]

3. Scale factor of 2:
- [tex]\( A'(2 \times 2, 4 \times 2) = (4, 8) \)[/tex]
- [tex]\( B'(4 \times 2, 0 \times 2) = (8, 0) \)[/tex]
- [tex]\( C'(6 \times 2, 6 \times 2) = (12, 12) \)[/tex]

4. Scale factor of 2.5:
- [tex]\( A'(2 \times 2.5, 4 \times 2.5) = (5, 10) \)[/tex]
- [tex]\( B'(4 \times 2.5, 0 \times 2.5) = (10, 0) \)[/tex]
- [tex]\( C'(6 \times 2.5, 6 \times 2.5) = (15, 15) \)[/tex]

Next, we compare these scaled coordinates with the vertices of [tex]\( A'B'C' \)[/tex].

The only set of calculations that leads to a practical dilation that fits the problem's context is the scale factor of 2:

- [tex]\( A'(4, 8) \)[/tex]
- [tex]\( B'(8, 0) \)[/tex]
- [tex]\( C'(12, 12) \)[/tex]

Therefore, the correct statement is:
[tex]\[ \text{Triangle } ABC \text{ is dilated by a scale factor of } 2. \][/tex]