No. No part of a circle is straight.
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(pie)ve.Truly, a circle has no straight sides.If you draw a shape with enough straight sides, it will look like a circle if you don't look too closely, but it will never be a circle.
A chord is a straight line that spans the circumference of a circle and the diameter of a circle is a straight line in a circle spanning its circumference and passing through the circle's centre.
A circle has no straight edges.
A polygon is a plane area bounded by straight lines. A circle consists of a curved line, not a straight line. Therefore a circle is not a polygon and conversely, no polygon can be a circle.
It is a straight line that touches the circle.