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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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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°