# Constructions

Geometric Constructions ... Animated!

 "Construction" in Geometry means to draw shapes, angles or lines accurately. These constructions use only compass, straightedge (i.e. ruler) and a pencil. This is the "pure" form of geometric construction - no numbers involved!

 Learn these two first, they are used a lot: Line Bisector Angle Bisector And it is useful to know how to do 30°, 45° and 60° angles. You can use the angle bisector method (above) to create other angles, such as 15°, etc: 30 Degree Angle 45 Degree Angle 60 Degree Angle Equilateral Triangle Points and Lines: Perpendicular to a Point on a Line Perpendicular to a Point NOT on a Line Parallel Line through a Point Same (Congruent) Angle Cut a line into N segments Circles: Center of a Circle Point to Tangents on a Circle Inscribe a Circle in a Triangle Circumscribe a Circle on a Triangle Circle touching 3 Points And for the "Master Class", a Pentagon Pentagon

(Note: You can also see how to Use the Protractor, Use the Drafting Triangle and Ruler, and How to construct a Triangle With 3 Known Sides, but they are not "pure" geometric constructions.)

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