Question 1193553
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The response from tutor @ikleyn is absolutely incorrect.<br>
In mathematics, a dilation can be an enlargement (dilation by a scale factor greater than 1) or a reduction (dilation by a scale factor less than 1).<br>
Use the Pythagorean Theorem (aka distance formula) to find the length of BC; then, since the scale factor is 1/2, divide by 2 (multiply by 1/2) to find the length of B'C'.<br>