It is a curved line that forms part of the circumference of a circle.
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An arc length is the measure of the distance along the curved line making up the arc. It is longer than the straight line distance between the two end points.
tangent
Radius
The same as a straight line.
Yes definitely. Draw a line. Set the compass to the length of that line. Place the point of the compass on one end of the line and prescribe an arc. Place the compass on the other end of the line and prescribe a second arc which intersects the first arc. Where they meet, draw lines to each end of the first line and you will have an equilateral triangle.