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2015-09-30T21:27:14+05:30

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Total sum of the angles of a quadrilateral is 360 degree.
So, the fourth angle =360-(100+84+76)
=360-260
=100.
Therefore, the fourth angle is 100 degree.

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2015-09-30T21:28:20+05:30

This Is a Certified Answer

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Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
Actually by definition the sum of angles in a quadrilateral is 360°. So therefore the 3rd Angle is 100°. Let angleA be 100° and angle B be 84° and C be 76°. angle A + angle B + angle C + angle D = 360°.. therefore we get the remaining angle as 100°
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