Question

(a+b, b+c) (a-b, c-b) find distance

Answer 1

$\sqrt{(a + b - (a - b))^{2} } + (b + c - (c - b))^{2}$
it's hole under root
$\sqrt{ {b}^{2} + {b}^{2} }$
$b \sqrt{2}$
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