find the measure of angle A in each quardrilateral using the exterior angle sum property
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The interior angle next to 74 = 180 - 74 = 106°
The interior angle next to 100 = 180 - 100 = 80°
The interior angle next to the right angle
= 180-90= 90°
The sum of interior angles of a quadrilateral = 360°
So the interior angle next to a = 360 -(106+80+90) = 360-276 = 84°
So angle A = 180 - 84 = 96°
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