Basic Geometric constructions

Basic Geometric constructions

With just a compass and a straightedge (or virtual versions of them), you’ll be amazed by how many geometric shapes you can construct perfectly.

Basic Geometric constructions

This is the “pure” form of geometric construction: no numbers involved.

straightedge

Basic Geometric constructions

Mostly used things were these two ⇓
Line BisectorLine Bisector
Angle BisectorAngle Bisector
And it is useful to know how to do 30°, 45° and 60° angles. We can use the angle bisector method (above) to create other angles, such as 15°, etc:
30 Degree Angle30 Degree Angle
45 Degree Angle45 Degree Angle
60 Degree Angle60 Degree Angle
Equilateral TriangleEquilateral Triangle
Points and Lines:
Perpendicular to a Point on a LinePerpendicular to a Point on a Line
Perpendicular to a Point NOT on a LinePerpendicular to a Point NOT on a Line
Parallel Line through a PointParallel Line through a Point
Same (Congruent) AngleSame (Congruent) Angle
Cut a line into N segmentsCut a line into N segments
Circles:
Center of a CircleCenter of a Circle
Point to Tangents on a CirclePoint to Tangents on a Circle
Inscribe a Circle in a TriangleInscribe a Circle in a Triangle
Circumscribe a Circle on a TriangleCircumscribe a Circle on a Triangle
Circle touching 3 PointsCircle touching 3 Points
And for the “Master Class”, a Pentagon
PentagonPentagon
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