An arc has no straight sides because its part of the circumference of a circle
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This is a segment of a circle.The straight line is a chord.The curved line is an arc.
An arc (segment of a circle) has one straight side, and one curved side.
The same as a straight line.
Taking a straight line/ Place a POINT on that straight line. Sweep an arc from one side of the point to the other side of the point. That arc is 180 degrees.
Jimmel - A Polygon with four or more sides with one tagged side. The tag is on a line and not on an angle. Within the jimmel there is a line between two verticies and all of the sides are straight lines. Dibble - A polygon made up of straight lines where one side is a mirror image to the other. The two sides are separated by a arc-line-arc. If the polygon has equal sides but is not separated by a arc-line-arc then it is not a dibble. All of the sides in a dibble are straight lines. )---------------( = arc-line-arc I think that it is silly for teachers to encourage children to make up words in fifth grade. Especially when I am encouraging my son to look everything up. How foolish would he have felt if I sent him on a search for this definition? Anyway, on the topic of made up words... Frindle by Andrew Clements is a book that my son enjoyed.