## Construct.CompassStraightedge History

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Related themes:

- Second Level Constructions? (compass and triangles)

Related themes:

- Second Level Constructions? (compass and triangles)

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**NOT**on m \,\,. Goal: Construct (find) a line p passing through C \,\,and parallel to m \,\,.

**NOT**on m \,\,. Goal: Construct (find) a line p passing through C \,\,and parallel to m \,\,.

Goal: To construct a line segment with start point P on this line such that the line segments are congruent (lengths are equal).

Goal: To construct a line segment with start point P on this line such that the line segments are congruent (lengths are equal).

Related themes:

- Second Level Constructions? (compass and triangles)

Related themes:

- Second Level Constructions? (compass and triangles)

*** To use this today, you need to go to geogebra.org -> Future and download the pre-release of GeoGebra 3.1 ***

*** To use this offline today, you need to get the pre-release of GeoGebra 3.1: Click here ***

*** To use this today, you need to go to geogebra.org -> Future and download the pre-release of GeoGebra 3.1 ***

**NOT**on m \,\,.

**NOT**on m \,\,.

"Take your compass and stick the needle in point B and widen it until it reaches point C.

"a.k.a. Take your compass and stick the needle in point B and widen it until it reaches point C.

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

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

**NOT**on m \,\,. Goal: To construct (find) a line p passing through C \,\,and parallel to m \,\,.

**NOT**on m \,\,. Goal: Construct (find) a line p passing through C \,\,and parallel to m \,\,.

Reference link: http://www.mathopenref.com/constperpendray.html

Reference link http://www.mathopenref.com/constparallel.html

[] Up one level

[] Up one level

Reference link: http://www.mathopenref.com/constperpendray.html

Reference link: http://www.mathopenref.com/constperpendray.html

2. copy an angle

**NOT**on m \,\,. Goal: To construct (find) a line p passing through C \,\,and parallel to m \,\,.

http://www.mathopenref.com/constparallel.html

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!

Goal: To construct a point D on m \,\,such that \overline{CD}\,\, is congruent to \overline{AB} \,\, (lengths of segments are equal).

Reference link: http://www.mathopenref.com/constperpendray.html

Goal: To construct a point D on m \,\,such that \overline{CD}\,\, is congruent to \overline{AB} \,\, (lengths of segments are equal).

Now stick the needle in point A and draw a circle."

Now stick the needle in point A and draw a circle."

"Take your compass and stick the needle in point B and widen it until it reaches point C. Now stick the needle in point A and draw a circle."

"Take your compass and stick the needle in point B and widen it until it reaches point C.

Now stick the needle in point A and draw a circle."

c10"Take your compass and stick the needle in point B and widen it until it reaches point C. Now stick the needle in point A and draw a circle."

"Take your compass and stick the needle in point B and widen it until it reaches point C. Now stick the needle in point A and draw a circle."

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!

Rename Move the drawing pad Zoomout Undo

Angles with 3 points - Checking only!

The GeoGebra file: BasicConstruct.ggb.

Here is a little mathcast (video) explaining how to get the "givens" ...

(printable pdf)

Here is a little mathcast (video) explaining a few more useful techniques ...

Click here to download the ggb file: BasicConstruct.ggb or BasicConstructW.ggb or just the new tool CircleCentarDistance.ggt

Click here to download the ggb file: BasicConstruct.ggb.

Click here to download the ggb file: BasicConstructs.ggb or BasicConstructsW.ggb or just the new tool CircleCentarDistance.ggt

Click here to download the ggb file: BasicConstruct.ggb or BasicConstructW.ggb or just the new tool CircleCentarDistance.ggt

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Click here to download the ggb file: http://mathcasts.org/mtwiki/uploads/Construct/BasicConstructs.ggb or http://mathcasts.org/mtwiki/uploads/Construct/BasicConstructsW.ggb or just the new tool http://mathcasts.org/mtwiki/uploads/Construct/CircleCentarDistance.ggt

Click here to download the ggb file: BasicConstructs.ggb or BasicConstructsW.ggb or just the new tool CircleCentarDistance.ggt

Click here to download the ggb file: http://mathcasts.org/mtwiki/uploads/construct/BasicConstructs.ggb or http://mathcasts.org/mtwiki/uploads/construct/BasicConstructsW.ggb or just the new tool http://mathcasts.org/mtwiki/uploads/construct/CircleCentarDistance.ggt

Click here to download the ggb file: http://mathcasts.org/mtwiki/uploads/Construct/BasicConstructs.ggb or http://mathcasts.org/mtwiki/uploads/Construct/BasicConstructsW.ggb or just the new tool http://mathcasts.org/mtwiki/uploads/Construct/CircleCentarDistance.ggt

Click here to download the ggb file: Attach:BasicConstructs.ggb Δ or Attach:BasicConstructsW.ggb Δ or just the new tool Attach:CircleCentarDistance.ggt

Click here to download the ggb file: http://mathcasts.org/mtwiki/uploads/construct/BasicConstructs.ggb or http://mathcasts.org/mtwiki/uploads/construct/BasicConstructsW.ggb or just the new tool http://mathcasts.org/mtwiki/uploads/construct/CircleCentarDistance.ggt

- Circle with center and radius: the distance between 2 points Attach:circendis.jpg Δ and

- Circle with center and radius: the distance between 2 points and

- Second Level Constructions? (compass and triangles)

- Second Level Constructions? (compass and triangles)

Regulation: You can "use" a ruler for a straightedge, but you cannot use the measurements on it!

How do we do?

Circle 1 Circle 2 Intersect pointHere is a little mathcast (video) explaining how to get basic setups ...

Here is a little mathcast (video) explaining how to get the "givens" ...

- New Point and

We use: New Point (and Move tool: )

a line m with a point AWe use: Line through two points (and Move tool: )

a line mWe use: Line through two points (and Move tool: )

a circle an angle- Angle and Distance

Click here to download the ggb file: BasicConstructs.ggb? or BasicConstructsW.ggb? or just the new tool CircleCentarDistance.ggt?

Click here to download the ggb file: BasicConstructs.ggb? or BasicConstructsW.ggb? or just the new tool CircleCentarDistance.ggt?

Here is a little mathcast (video) explaining this ...

Pencil tools: Point and Intersection point

Staightedge tool: Line through two points and (if desired) Ray and Segment .

Compass tools: Circle with center and radius-distance between 2 points Attach:circendist.jpg Δ

Circle with center and radius and radius (type in)

Checking tools: Some fun tools for checking our work ... Angle and Distance

Decoration Tools

Circle with center and radius and radius (type in).

Checking tools: Some fun tools for checking our work ... Angle and Distance Move and Select Tools Attach:move.jpg Δ, Attach:move_dp.jpg Δ, Attach:zoomout.jpg Δ, Attach:zoomin.jpg ΔHere is a little mathcast (video) explaining this ...

Compass tools: Circle with center and radius and the function `Distance[]`

Some fun tools for checking our work ... Angle and Distance

[ valign=middle]Brief

[]User uses GeoGebra to do pencil, straightedge and compass geometric constructions.

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[]Goal

[]Understanding straightedge and compass constructions

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[]Grade

[]7-9 (7th grade, geometry)

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[]Strand

[]Measurement and Geometry, Geometry

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[]Standards

[]CA 7.MG.3.1, CA Geometry 16.0

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[]Keywords

[]geometric, construct, construction, straightedge, compass, ruler, geogebra

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[]Comments

[]Suitable for 7th-grade on up.

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[]Source

[]Linda Fahlberg-Stojanovska (no copyright)

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[]Cost

[]Activity and software is free to use

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[ valign=middle]Download

[]Zip for offline use: tri_median_right.zip (includes handout, teachers page, 2 ggb interactivities)

Requires freeware GeoGebra for offline use.

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[]Type

[]Java Applet so requires free sunJava player