By a straight angle I assume you mean an 180° angle, so two angles that form a 180° angle would be called supplementary angles.
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A straight angle is an angle.
two straight angles
An obtuse and an acute angle together are the two angles together that form a straight line. However, together they must add up to 180 degrees.
Supplementary angles
The angles of a semi-circle are on a straight line and angles on a straight line add up to 180 degrees.