CBS Thurles blog

Blog posts for C.B.S. Thurles secondary school

Harty Cup ’09 ’10

Posted by jkenehan6301 on 15 May, 2011

A series of images from the Harty Cup from the years 2009 and 2010.

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Posted in 3rd Year ICT, General News, Sport | No Comments »

Introduction to Constructions

Posted by Robert Chaney on 15 May, 2011

Constructions:  the drawing of various shapes using only a compass and straightedge or ruler. No measurement of lengths or angles is allowed.

The word construction in geometry has a very specific meaning: the drawing of geometric items such as lines and circles using only a compass and straightedge or ruler. Very importantly, you are not allowed to measure angles with a protractor, or measure lengths with a ruler.

A Pair of Compasses

Also just called the compass, it is a drawing instrument used for drawing circles and arcs. It has two legs, one with a point and the other with a pencil or lead. You can adjust the distance between the point and the pencil and that setting will remain until you change it. (This kind of compass has nothing to do with the kind used find the North direction when you are lost).

A Straight-edge

A straightedge is simply a guide for the pencil when drawing straight lines. In most cases you will use a ruler for this, since it is the most likely to be available, but you must not use the markings on the ruler during constructions. If possible, turn the ruler over so you cannot see them.

Which ones?

There are 22 constructions in total, although not all of them are needed for some exams. By selecting the relevant category from the drop down window on the left-hand side, a selection of constructions that must be learnt will appear listed.

Resources available

For most of them, you will find a video demonstrating the process, an animation, a step-by-step guide, and a worksheet for you to complete.

Each video is about two minutes long, showing each step with audio commentary.

The animation is flash-based diagramatic visualisation of the process of creating the construction.

The step-by-step guide is a printable record of each step demonstrated in the flash animation.

The worksheet is a printable set of activities to repeat the relevant construction.

Alternatively, open the following CONSTRUCTIONS PDF file which lists each construction depending on your level/certificate, and links to all of these resources.

Happy drawing!

Posted in Constructions, JC - 1st Yr, JC Higher, JC Ordinary, Junior Certificate, LC Foundation, LC Higher, LC Ordinary, Leaving Certificate, Mathematics | No Comments »

Construction 1 – Bisector of a given angle, using only compass and straight edge.

Posted by Robert Chaney on 15 May, 2011

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Posted in Constructions, JC - 1st Yr, JC Higher, JC Ordinary, Junior Certificate, LC Foundation, LC Higher, LC Ordinary, Leaving Certificate, Mathematics | No Comments »

Construction 2 – Perpendicular Bisector of a Line Segment

Posted by Robert Chaney on 15 May, 2011

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Posted in Constructions, JC - 1st Yr, JC Higher, JC Ordinary, Junior Certificate, LC Foundation, LC Higher, LC Ordinary, Leaving Certificate, Mathematics | No Comments »

Construction 3 – Line perpendicular to a given line l, passing through a given point not on l

Posted by Robert Chaney on 15 May, 2011

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Posted in Constructions, General News, JC Higher, Junior Certificate, LC Higher, Leaving Certificate, Mathematics | No Comments »

Construction 4 – Line perpendicular to a given line l, passing through a given point on l

Posted by Robert Chaney on 15 May, 2011

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Posted in Constructions, JC - 1st Yr, JC Higher, JC Ordinary, Junior Certificate, LC Foundation, LC Higher, LC Ordinary, Leaving Certificate, Mathematics | No Comments »

Construction 5 – Line parallel to given line, through given point

Posted by Robert Chaney on 15 May, 2011

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Posted in Constructions, JC - 1st Yr, JC Higher, JC Ordinary, Junior Certificate, LC Foundation, LC Higher, LC Ordinary, Leaving Certificate, Mathematics | No Comments »

Construction 6 – Division of a segment into 2, 3 equal segments, without measuring it

Posted by Robert Chaney on 15 May, 2011

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Posted in Constructions, JC - 1st Yr, JC Higher, JC Ordinary, Junior Certificate, LC Foundation, LC Higher, LC Ordinary, Leaving Certificate, Mathematics | No Comments »

Construction 7 – Division of a segment into any number of equal segments, without measuring it

Posted by Robert Chaney on 15 May, 2011

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Construction 8 – Line segment of given length on a given ray

Posted by Robert Chaney on 15 May, 2011

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Posted in Constructions, JC - 1st Yr, JC Higher, JC Ordinary, Junior Certificate, LC Foundation, LC Higher, LC Ordinary, Leaving Certificate, Mathematics | No Comments »

Construction 9 – Angle of given number of degrees with a given ray as one arm

Posted by Robert Chaney on 15 May, 2011

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Posted in Constructions, JC Higher, JC Ordinary, Junior Certificate, LC Foundation, LC Higher, LC Ordinary, Leaving Certificate, Mathematics | No Comments »

Construction 10 – Triangle, given lengths of three sides

Posted by Robert Chaney on 15 May, 2011

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Posted in Constructions, JC Higher, JC Ordinary, Junior Certificate, LC Foundation, LC Higher, LC Ordinary, Leaving Certificate, Mathematics | No Comments »

Construction 11 – Triangle, given SAS data

Posted by Robert Chaney on 15 May, 2011

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Posted in Constructions, JC Higher, JC Ordinary, Junior Certificate, LC Foundation, LC Higher, LC Ordinary, Leaving Certificate, Mathematics | No Comments »

Construction 12 – Triangle, given ASA data

Posted by Robert Chaney on 15 May, 2011

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Posted in Constructions, JC Higher, JC Ordinary, Junior Certificate, LC Foundation, LC Higher, LC Ordinary, Leaving Certificate, Mathematics | No Comments »

Construction 13 – Right-angled triangle, given the length of the hypotenuse and one other side

Posted by Robert Chaney on 15 May, 2011

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Posted in Constructions, JC Higher, JC Ordinary, Junior Certificate, LC Foundation, LC Higher, LC Ordinary, Leaving Certificate, Mathematics | No Comments »

Hello Third Years

Posted by Robert Chaney on 30 March, 2011

Hello. Please finish your Animoto photo slideshow, using photos from the sponsored walk, or any of the Harty matches.

Use the ANIMOTO.COM website. Most of you should have created a login account last week.

Sign in.

Click Create Video

Choose a video style

Select the “30-second video for free” option and start adding slides

The photos can be found in the Common Folder, under “Photos”.

Make sure you add text slides to give a title, and then any extra info that is appropriate.

If you have any spare moment in the lesson (video busy being rendered), try to continue discussions about what you have been planning in your groups e.g. podcast, video, animation etc.

Also, please vote in the poll, down the bottom on the right-hand-side. (Up the Cats!)

Oh, and if you have access to this site, please add a comment below. I think the proxy block has been removed, but I need to test it. Thanks.

And as a Homework, can I suggest you check out Xtranormal.com and Storybird.com, as other media creation websites. We’ll look at them next week.

Posted in 3rd Year ICT | 2 Comments »

Can you comment?

Posted by Robert Chaney on 23 March, 2011

Posted in 3rd Year ICT | 7 Comments »