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Gnoma [55]
3 years ago
12

I need help with this question

Mathematics
1 answer:
dybincka [34]3 years ago
7 0

Answer:

1) 144

2) 1

Step-by-step explanation:

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suppose you have ab on a coordinate plane located at a(-3,-4) and b(5,-4). under a dilation centered at (9,0), ab becomes a'b' w
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The distace between the center of dilation and point a is diven by:

d=\sqrt{(9-(-3))^2+(0-(-4))^2} \\  \\ =\sqrt{(9+3)^2+(0+4)^2}=\sqrt{12^2+4^2} \\  \\ =\sqrt{144+16}=\sqrt{160}=\sqrt{16\times10}=4\sqrt{10}

The distance between the center of dilation and point a' is given by:

d=\sqrt{(9-6)^2+(0-(-1))^2} \\ \\ =\sqrt{3^2+(0+1)^2}=\sqrt{3^2+1^2} \\ \\ =\sqrt{9+1}=\sqrt{10}

It can be seen that the distance from the center of dilation to the image is 1/4 times the distance from the centre of dilation to the preimage.

Therefore, the scale factor is 1/4.
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