Question: what are the three types of triangles classified by sides
[{'answer': 'equilateral triangle', 'provenance': [{'wikipedia_id': '30654', 'title': 'Triangle', 'start_paragraph_id': 9, 'start_character': 370, 'end_paragraph_id': 9, 'end_character': 390, 'bleu_score': 1.0, 'section': 'Section::::Types of triangle.:By lengths of sides.\n'}]}, {'answer': 'isosceles triangle', 'provenance': [{'wikipedia_id': '30654', 'title': 'Triangle', 'start_paragraph_id': 9, 'start_character': 431, 'end_paragraph_id': 9, 'end_character': 449, 'bleu_score': 1.0, 'section': 'Section::::Types of triangle.:By lengths of sides.\n'}]}, {'answer': 'scalene triangle', 'provenance': [{'wikipedia_id': '30654', 'title': 'Triangle', 'start_paragraph_id': 9, 'start_character': 494, 'end_paragraph_id': 9, 'end_character': 510, 'bleu_score': 1.0, 'section': 'Section::::Types of triangle.:By lengths of sides.\n'}]}, {'provenance': [{'wikipedia_id': '30654', 'title': 'Triangle', 'start_paragraph_id': 7, 'start_character': 0, 'end_paragraph_id': 7, 'end_character': 613, 'bleu_score': 0.632134243133195, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5275452400237664509}, 'section': 'Section::::Types of triangle.:By lengths of sides.\n'}]}]