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Leaving Cert Higher Level Maths Constructions

By TheMathsTutor.ie inConstructions, Leaving Cert Essentials

The Leaving Cert Higher Level maths constructions course contains 22 geometry constructions, 15 of which you will have already covered in Junior Cert Higher constructions.

Some of these first 15 form the basic steps of the more advanced constructions, so it is important to master Leaving cert constructions maths first. When you are comfortable with constructions 1 to 15, you can move on to the remaining 7 constructions which are required for the Leaving Cert Higher maths course.

Geometry constructions have been examined intermittently in the Leaving Cert Higher exam, and certainly not every year. However, if you are aiming for a high grade, you can’t afford to neglect this part of the course as this will surely help you score in your maths exam papers.

For general guidance on how to learn and revise maths constructions, click here.


Here’s the full list of LC maths constructions, and the demo videos are embedded below this.

1 – Bisector of an angle, using only compass and straight edge

2 – Perpendicular bisector of a segment, using only compass and straight edge

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

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

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

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

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

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

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

10 – Triangle, given lengths of 3 sides

11 – Triangle, given SAS data

12 – Triangle, given ASA data

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

14 – Right-angled triangle, given one side and one of the acute angles

15 – Rectangle given side lengths

16 – Circumcentre and circumcircle of a given triangle, using only straight edge and compass

17 – Incentre and incircle of a triangle of a given triangle, using only straight edge and compass

18 – Angle of 60⁰ without using a protractor or set square

19 – Tangent to a given circle at a given point on it

20 – Parallelogram, given the length of the sides and the measure of the angles

21 – Centroid of a triangle

22 – Orthocentre of a triangle

See below for our demonstration videos showing you exactly how to do these Leaving Certificate Higher Level Maths constructions.

If you need any further help or clarification, get in touch with us at any time!


All 22 Leaving Cert Higher Maths Constructions

Full Playlist – all 22 constructions on our YouTube channel

1 – Bisector of an angle, using only compass and straight edge

2 – Perpendicular bisector of a segment, using only compass and straight edge

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

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

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

6 and 7 – Division of a line into 2, 3 or any number of equal segments without measuring it

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

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

10 – Triangle, given lengths of 3 sides

11 – Triangle, given SAS data

12 – Triangle, given ASA data

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

14 – Right-angled triangle, given one side and one of the acute angles

15 – Rectangle given side lengths

16 – To construct the circumcentre and circumcircle of a given triangle.

17 – To construct the in-centre and in-circle of a given triangle.

18 – Use this interactive file to construct an angle of 60 degrees.

19 – Use this file to learn to construct the tangent to a circle at a given point on it.

20 – Use this file to learn to construct a parallelogram, given the length of sides and the measure of the angles.

21 – Use this file to learn to construct the centroid of a triangle.

22 – Use this file to learn to construct the orthocentre of a triangle.


If you enjoyed our blog on Leaving Cert Higher Maths Constructions, be sure to check out or other blog on Leaving Cert Ordinary Constructions.

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