Question: what is the interior angle of a 20 sided polygon
[{'answer': '162 °', 'provenance': [{'wikipedia_id': '445032', 'title': 'Icosagon', 'start_paragraph_id': 4, 'start_character': 44, 'end_paragraph_id': 4, 'end_character': 49, 'bleu_score': 1.0, 'section': 'Section::::Regular icosagon.\n'}]}]