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When you used a compass, there is inconvenience to use both thing, compass and ruler.
Also when you portrayed another circle, there is inconvenience to catch the axis of a
compass and 0 graduation of ruler.
If the zero scale of ruler is on the one foot of it, you don't have to fix one foot on the ruler.
If you have a compler,drawing reduce the time.
Gyeongbuk, Korea, South Korea
Gyeongsan, South Korea