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Before using the cylinder to make some construction or models (such as drilling or cutting into equal parts), people should found out where the circle centre is first. Some of them try to use rulers to do that, but it wont be accurate, or others may choose very expensive device. According to the observation, I want to use just a small ruler to meet their needs find out the circle centre easily and cheap.
Taichung City, Taiwan
National Taiwan University Of
Science And Technology