Circles were drawn by ancient peoples before writing was developed. No one "invented" or "made" the circle from that perspective.
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A circle doesn't have line segments. It is a curve, not made up of straight lines.A circle doesn't have line segments. It is a curve, not made up of straight lines.A circle doesn't have line segments. It is a curve, not made up of straight lines.A circle doesn't have line segments. It is a curve, not made up of straight lines.
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It is unknown who created the unit circle. Pythagoras did a lot of work related to the unit circle. In ancient times, Greek, Indian, and Arabian mathematicians used the unit circle.
You could use a knife, scissors, or a chainsaw, depending what material your circle is made from.
A circles has no perpendicular lines. Perpendicular lines are two straight lines that join forming 90 degree angles. They are found in squares, rectangles, and right-angled triangles. A circle is made by one line that is not straight but is curved. If you drew a circle, rectangle, right-angled triangle, or cross in the circle, then the circle would contain perpendicular lines. But the circle itself would have no perpendicular lines.