Supplementary angles that are not in a linear pair

Pictured here is an iPad keyboard. The right angles formed by the keys are supplementary to each other. I know this because the measure of right angles are 90 degrees and for two angles to be supplementary their sum must be 180 degrees. Keyboards have turned into a common product since the invention of the computer and can be seen on an every day basis at school. They are used for typing on your electronic device and are very useful and efficient for taking notes and writing papers. People that can be seen with a keyboard include Bill Gates, Ms. Fort, and Mr. Lagarde. I found this object in my backpack and use it nearly everyday.