Question: who discovered the formula for the circumference of a circle
[{'answer': 'Archimedes', 'provenance': [{'wikipedia_id': '5916', 'title': 'Circumference', 'start_paragraph_id': 9, 'start_character': 52, 'end_paragraph_id': 9, 'end_character': 62, 'bleu_score': 1.0, 'section': 'Section::::Circle.:Relationship with.\n'}]}, {'provenance': [{'wikipedia_id': '5916', 'title': 'Circumference', 'start_paragraph_id': 9, 'start_character': 0, 'end_paragraph_id': 9, 'end_character': 489, 'bleu_score': 0.7987244280418301, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11067967607637549217}, 'section': 'Section::::Circle.:Relationship with.\n'}]}]