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14 September, 01:39

Calculate the 4th angle of a quadrilateral if the other sides are 56, 115 and 120.

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  1. 14 September, 03:09
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    69°

    Step-by-step explanation:

    The sum of the interior angles of a quadrilateral = 360°

    Subtract the sum of the given angles from 360, that is

    4 th angle = 360° - (56 + 115 + 120) ° = 360° - 291° = 69°
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