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27 March, 16:58

A quadrilateral has three angles that measure 90o, 100o, and 120o. which is the measure of the fourth angle?

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  1. 27 March, 19:29
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    The Interior Angles of a Quadrilateral add up to 360°, so:

    the measure of the fourth angle = 360 - 90 - 100 - 120 = 50°
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