When the exact bending angle is not important, but rather the span and the arc depth, we talk of arc segments. Span and arc depth are also referred to by the mathematical terms ‘chord’ and ‘sagitta’.
Of course, you may also provide the net length to be bent and the radius for an arc segment.
Arc segments can also be combined into a complete circle. But often a complete circle is not needed for the application, such as rafters or outer wall elements.