<https://www.vedantu.com/ncert-solutions/ncert-solutions-class-8-maths-chapter-11-exercise-11-2>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.vedantu.com/ncert-solutions/ncert-solutions-class-8-maths-chapter-11-exercise-11-2>