In a quadrilateral the angles are $40 °, 120 °, 10 ° a n d x .$ Find $x$

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$40 °$

$170 °$

$120 °$

$190 °$

answer is C.

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Detailed Solution

A quadrilateral is basically a four sided polygon. Thus, the sum of all the interior angles is 360°.
Therefore,
$40 ° + 120 ° + 10 ° + x = 360 °$
$170 ° + x = 360 °$
$x = 190 °$

Hence, the determined value of $x$ is $190 °$

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