How to make cogs.

Yesterday on the 25th of March, room 9 was making cogs out of cardboard.We first cut out a circle. Next we had to draw a smaller circle inside the cardboard. Then we had to use the ruler to measure the tooth part of the cog. After that we had to make a cut in the cardboard following a pattern. Then we had to stick our own pencils in the middle of the cog so it would overlap with the other cog. At the end we took a picture of us with our cog.