Goodheart-Willcox Co., Inc. Bisect a LineEnter Line command and enter Midpoint object snap.Pick near midpoint of Line AB.Draw line in any direction.

Permission granted to reproduce for educational use only.#8Section 2Drafting Techniques and SkillsChapter 6Basic Geometric ConstructionsPermission granted to reproduce for educational use only.#2 Goodheart-Willcox Co., Inc.ObjectivesUse manual drafting tools and methods to make geometric constructions.Use CAD commands and methods to make geometric constructions.Draw, bisect, and divide lines.Construct, bisect, and transfer angles.Permission granted to reproduce for educational use only.#3 Goodheart-Willcox Co., Inc.ObjectivesDraw triangles, squares, hexagons, and octagons.Use special techniques to construct regular polygons.Construct circles and arcs.Permission granted to reproduce for educational use only.#4 Goodheart-Willcox Co., Inc.Geometric ConstructionsWidely used in drafting.Based on principles of plane geometry.Proper instruments required in manual work.Most efficient methods should be used in CAD work.

Permission granted to reproduce for educational use only.#5 Goodheart-Willcox Co., Inc.Constructions for Straight LinesBisecting linesDrawing parallel linesDrawing perpendicular linesDividing linesPermission granted to reproduce for educational use only.#6 Goodheart-Willcox Co., Inc.Divide a Line Into Proportional PartsDraw vertical line at Point B (Line BC).Place scale so that nine equal divisions are between Point A and Line BC.Mark proportional divisions and project them parallel to Line BC on Line AB.

Permission granted to reproduce for educational use only.#14 Goodheart-Willcox Co., Inc.Divide a Line Into a Given Number of Equal PartsEnter Divide command and select Line AB.Specify number of divisions (seven).Change point style to display markers if needed.

Permission granted to reproduce for educational use only.#15 Goodheart-Willcox Co., Inc.Angle Symbols and Types of Angles

Permission granted to reproduce for educational use only.#17 Goodheart-Willcox Co., Inc.Bisect an AngleStrike Arc D using arbitrary radius.Strike arcs from intersections of arcs and the angle.Draw Line AE where new arcs intersect.

Permission granted to reproduce for educational use only.#18 Goodheart-Willcox Co., Inc.Bisect an AngleEnter Line command and pick Point A as first point.Enter Mid Between Points object snap.Pick Point B and then Point C to draw the bisector.

Permission granted to reproduce for educational use only.#19 Goodheart-Willcox Co., Inc.Transfer an AngleStrike equal arcs from Points A and A.Draw arc from Point E to intersect Point F.Draw arc with same radius from Point E.Draw Line AC.

Permission granted to reproduce for educational use only.#20 Goodheart-Willcox Co., Inc.Draw a PerpendicularLay off three equal segments on Line AB.Strike Arc C with radius of four units and center at Point B.Strike Arc D with radius of five units and center at Point A.Draw perpendicular where arcs intersect.

Permission granted to reproduce for educational use only.#22 Goodheart-Willcox Co., Inc.Lay Out a Given AngleAlign protractor on Line AB to mark desired angle (35).Draw line from vertex indicator (Point C) to Point D.

Permission granted to reproduce for educational use only.#24 Goodheart-Willcox Co., Inc. Lay Out a Given AngleEnter Line command and use polar coordinates to draw inclined line at 60.Specify Point C as first point.Enter @6