Fill in the blanks with acute $,$ obtuse $,$ right or straight $:$
When the sum of the measures of two angles is that of a straight angle and one of them is acute then the other should be ______

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Solution

If two angles add up to $180 °$ degrees then they are supplementary $.$
If one angle is less than $90 °$ then other angle will be greater than $90 °$ i $.$ e $.$ other angle will be an obtuse angle $.$
Hence $,$ When the sum of the measures of two angles is that of a straight angle and one of them is acute then the other should be an obtuse angle

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