PeriO
This is a compass that can independently determine the radius. In addition to drawing circles, it can also draw arcs and straight lines. The radius is adjusted by moving the two sides and displayed on the disc. The middle inserting pen is made of silicone, which can be applied to pens of different sizes. The length of the drawn line and the angle of the arc can be calculated by the rotation of the wheel. When the angle between the two sides is 180 degrees, the drawn line is a straight line. In addition, the disc in the middle can be rotated to make the process of drawing a circle smoother.
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