Two instruments that could be used to measure curved lines are a flexible ruler and a caliper. A flexible ruler, also known as a contour gauge, can be molded to the shape of the curved line to measure its length accurately. A caliper, specifically a vernier caliper, can be used to measure the diameter or thickness of a curved object by gently gripping and measuring across the curve.
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It could be a stretched circle - a bit like an ellipse except that an ellipse does not have straight lines.
no
polygons can't have any curved sides
with a pencil
no