Question: how many angles of rotation does a octagon have
[{'answer': '8', 'provenance': [{'wikipedia_id': '314575', 'title': 'Octagon', 'start_paragraph_id': 1, 'start_character': 109, 'end_paragraph_id': 1, 'end_character': 110, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '314575', 'title': 'Octagon', 'start_paragraph_id': 8, 'start_character': 0, 'end_paragraph_id': 8, 'end_character': 241, 'bleu_score': 0.51539050239592, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8218289200710663672}, 'section': 'Section::::Regular octagon.\n'}]}]