A bend of what angle is considered as a single bend

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A bend of what angle is considered as a single bend?
A. 45°
B. 90°
C. 180°
D. 270°
Correct option is B. 90°

In the reverse bend test, a single bend is usually considered to be 90° in each test. The machine goes both back and forth each time 90°, making a total of 180°, but one bend is considered to be 90°.