Answered By: Sheila Cornelisse Last Updated: Jul 17, 2017 Views: 42
HI Victoria - you could try doing some calculations using the formula for polygon angles. You can find an explanation here: http://www.algebra.com/algebra/homework/Polygons/Polygons.faq.question.463059.html.
This link takes you to a question that is somewhat similar to yours, then shows the equation you need to do to find the answer:
The Math League website has a good general introduction to polygons here: http://www.themathleague.com/index.php?option=com_content&view=article&id=75:figuresandpol..
All the best!