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While a curve is one continuous motion, you can create the illusion of a curve by using straight lines. In order to do this, draw a continuous pattern of short straight lines, while changing the direction of each line slightly.
When straight lines are perpendicular to each other they create right angles of 90 degrees
Any "straightedge" whether it be the side of a book, piece of paper, etc. can be used to create a straight line. Rulers, are common straightedges, as they are tools specifically meant to draw and measure lines.
Two straight lines that remain equal distance apart are parallel lines.
Polygon: A closed shape bounded by straight lines.