If A(1, ,2, ,3), ,B( - 1, - 1, - 1) be the points, then the dista… - Vidyadip

MCQ

If $A(1,\,2,\,3),\,B( - 1, - 1, - 1)$ be the points, then the distance $AB$ is

A
$\sqrt 5 $
B
$\sqrt {21} $
✓
$\sqrt {29} $
D
None of these

✓

Answer

Correct option: C.

$\sqrt {29} $

c
(c) $AB = \sqrt {{{( - 1 - 1)}^2} + {{( - 1 - 2)}^2} + {{( - 1 - 3)}^2}} $

$AB = \sqrt {4 + 9 + 16} = \sqrt {29} $.

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