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Problem: How will you a square without using the Regular polygon tool? ...ing the Regular polygon tool. We will also reinforce the use of the angle tool, this time, learn how to use it to measure angle using three points.

...ds a circle through the three given points (if they do not lie on the same line). ...dius]], and [[File:Mode circle3.svg|link=|20px]] [[Circle through 3 Points Tool|Circle through 3 Points]] tools.}}

;Line( <Point>, <Point> ):Creates a line through two points ''A'' and ''B''. ...allel Line> ):Creates a line through the given point parallel to the given line.

:* two lines are parallel :* a point lies on a line or conic

;PerpendicularLine( <Point>, <Line> ) :Creates a line through the point perpendicular to the given line.

{{Tool|icon=Mode polardiameter.svg|name={{PAGENAME}}|type=special line}} : This tool creates the polar or diameter line of a conic section.

; Tangent( <Line>, <Conic> ) : Creates (all) tangents to the conic section that are parallel to the given line.

{{Tool|icon=Mode parallel.svg|name={{PAGENAME}}|type=special line}} ...cting a line ''g'' and a point ''A'' defines a straight line through ''A'' parallel to ''g''.

{{Tool|icon=Mode tangent.svg|name={{PAGENAME}}|type=special line}} ...conic produces all tangents to the conic that are parallel to the selected line.