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Two angles are called suplementary angles if they form a straight angle, that is to say 180 degrees.

Q: What are two angles called that together form a straight angle?

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By a straight angle I assume you mean an 180° angle, so two angles that form a 180° angle would be called supplementary angles.

Angles that are 180 degrees (θ = 180°) are known as straight angles. • Angles between 180 and 360 degrees (180°< θ < 360°) are called reflex angles.

Any two angles who's measures add up to 180 degrees form a straight angle.

A straight angle is an angle that measures 180 degrees and is drawn as a straight line. A straight angle is composed of two right angles whose measures are 90 degrees each.

reflex

a straight angle is an angle equal to 180°.

A right angle joint is called a vertex as is with any other angle (yes even straight angles)

A straight angle is an angle.

Angles larger than a right angle and smaller than a straight angle (between 90° and 180°) are called obtuse angles ("obtuse" meaning "blunt"). An angle equal to 1. /. 2 turn (180° or π radians) is called a straight angle.

All straight angles are 180 degrees

An angle comprises two straight line segments or rays together with the point at which they meet.

It is a straight line because angles on a straight line add up to 180 degrees but angles greater than 180 degrees are reflex angles