The first image would provide a good counterexample to the statement that all supplementary angles form straight angles.
Which pair of angles form straight angles?
A straight angle is also called a 'flat angle'. A straight angle pair is a set of two adjacent angles on a straight line that add up to 180° If ∠A + ∠B = 180°, then ∠A and ∠B form a straight angle pair (linear pair).
What angles are supplementary?
Two angles are called supplementary when their measures add up to 180 degrees.
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