Basic Constructions: Using only a pencil, a compass. and a straightedge ("unmarked" ruler)

Go to the construction videos and exercises!

Read and/or download materials

Worksheet Materials (Click on image to open pdf in new window)

Materials for Offline Use

Zip for offline use: constructs1.zip (includes pdf, 2 ggb files with new tool).
Requires freeware GeoGebra and sunJava player.

Metadata

Brief User uses GeoGebra to do straightedge and compass geometric constructions.
Goal Understanding straightedge and compass constructions
Grade 7-9 (7th grade, geometry)
Strand Measurement and Geometry, Geometry
Standards CA 7.MG.3.1,  CA Geometry 16.0
Keywords geometric, construct, construction, straightedge, compass, ruler, geogebra  
Comments Suitable for 7th-grade on up.
Source Linda Fahlberg-Stojanovska (no copyright)
Cost Activity and software is free to use
Download Zip for offline use: constructs1.zip (includes pdf, 2 ggb files with new tool).

Requires freeware GeoGebra for offline use.

Type Java Applet so requires free sunJava player

Second Level Constructions: Using a pencil, a compass and 2 triangles (similar, right, "unmarked").

Go to the construction videos and exercises!? (under construction)

Read and/or download materials

Note: Probably best to use 30°-60°-90° triangles - easier to get closer parallel lines.

Here - in order to keep the user from getting bogged down in basic constructions - a user is allowed:

  • given a point A on a line m - to use his right triangle to draw a line n normal (perpendicular) to m through A and
  • give a line m and a point C not on m - to use both triangles to draw a line p parallel to m through A.

Related themes:

Thanks: My special thanks to all my colleagues at the GeoGebra forum for their never-ending and oh-so-generous      help without which I could never do these activities!

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Leigh Gay  —  12 November 2008, 20:35  

8tr7dfan00bw9g25

 

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geometric, construct, construction, straightedge, compass, ruler, geogebra, application, geometry, program


Page last modified on November 12, 2008, at 08:35 PM