Question: arc length of a portion of a circle
[{'answer': 'circular segment', 'provenance': [{'wikipedia_id': '404049', 'title': 'Circular segment', 'start_paragraph_id': 1, 'start_character': 15, 'end_paragraph_id': 1, 'end_character': 31, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '404049', 'title': 'Circular segment', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 320, 'bleu_score': 0.968982777549629, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9277195100238510515}, 'section': 'Section::::Abstract.'}]}]