Adjacent Non-Supplementary Angles

The object in this post is a guitar case. This relates to geometry because it means we can find adjacent angles in our everyday music supplies. This object can be found in many music stores, where ever guitars are sold, and in people's homes. A guitar case is used to store and make travel easier for guitars. It help so they don't get dirty or damaged. This is a part of the music production industry and are sold very frequently. http://www.americanmusical.com/ItemImages/Large/24725.jpg