$A$ is a point on $x -$ axis with abscissa $- 8$ and $B$ is point on $y -$ axis with coordinate $15$ . Find distance $A B$ .

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Solution

$A = (- 8, 0), B = (0, 15)$

$A B = \sqrt{(- 8, - 0)^{2} + (0 - 15)^{2}}$

$= \sqrt{64 + 225} = 17 u n i t s$

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