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If two angles of a quadrilateral are right angles, and the third angle is acute, then the fourth angle is      obtuse     .

The sum of the interior angles of a quadrilateral is always 360°. Three angles of a certain parallelogram is described. Two are right, meaning, their measures are 90° and the other is acute, meaning, its measure is less than 90°. Let's say the measure is 89°. We will make an equation equating to 360°. Let the missing angle be represented as .

91° is the lowest whole number value of the missing angle that we can get because we used the maximum a while ago which is 89°. Here, we can say that the fourth angle is obtuse beacuse any angle above 90° is classified as obtuse.

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