The length of A"B" is 20 units
<h3>How to determine the length of A'B'?</h3>From the figure, we have:
A = (1, 4)
B = (4, 8)
The distance AB is:
So, we have:
Evaluate
This gives
AB = 5
The scale factor of dilation is 4.
So, we have:
A'B' = 5 * 4
Evaluate
A'B' = 20
Hence, the length of A"B" is 20 units
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