Composite Solid

This is a picture of the door to my pantry. This door is a composite solid because it is made up of a big rectangular prism with a small sphere on top of it. This door is used for opening and closing my pantry. If we did not have this door our food would all be visible to the people standing in the kitchen and that would not look very nice. The sphere on top of the door is a mandatory part of this door because if that piece was removed we would not be able to open and close the door to get to our food. I took this picture while I was home. I had never realized that this door was a composite solid.

Regular Octagon

         This is a picture of a donut I took at gymnastics. Donuts are mostly used by little class kids. The kids sit inside them and get rolled for fun. This piece of equipment is mostly just used for fun, but sometimes it is used for jumping. The donut has eight sides, so it is a octagon. The measure of the angles in this shape can be found by taking the number of sides: 8, and then subtracting two from that. Then you take 5 and multiply that by 180 which is equal to 1,080.  In order to find the measure of each individual angle you must divide 1,080 by 8 which equals 135. All of the angles in this octagon are congruent so this shape is a regular octagon.