Question

Find the distance between

A ( 7 , 13) and B ( 10,9)

Answer 1

$\sqrt{ {(10 - 7)}^{2} + {(9 - 13)}^{2} } \\ = \sqrt{ {3}^{2} + ( - 4) ^{2} } \\ = \sqrt{9 + 16} \\ = \sqrt{25} \\ = 5$
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Answer 2

HOLA

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$ab \: = \: \sqrt{(10 \: - 7) {}^{2} + \: (9 \: - \: 13) {}^{2} } \\ \\ ab \: = \: \sqrt{(3) {}^{2} + \: (4) {}^{2} } \\ \\ ab \: = \: \sqrt{9 \: + \: 16} = \: \sqrt{25} = \: 5$

So the distance is 5 units

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