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Subjects · Leaving Cert Design & Communication Graphics (DCG)

Leaving Cert Design & Communication Graphics (DCG): Axonometric projection

How often Axonometric projection comes up on the Design & Communication Graphics papers, every year it was asked, and questions to try.

HL Asked on 7 of the last 9 Higher Level papers, most recently in 2025. most years

OL Asked on 9 of the last 9 Ordinary Level papers, most recently in 2025. banker

Axonometric projection, Higher Level(9 marks)

Quick ones on Axonometric projection.

(a)In the axes method, how are the axonometric axes X, Y and Z related to the triangle abc?
  1. They are its sides
  2. They are its altitudes
  3. They are its angle bisectors
(b)Axes method: projectors from the folded-down plan (the XY plane) back into the view run parallel to which axis?
  1. The Y axis
  2. The X axis
  3. The Z axis
(c)Why is a semicircle drawn on a side of the axonometric triangle when folding down a plane of reference?
  1. The angle in a semicircle is 90°
  2. It locates the origin on the horizon
  3. It keeps lengths at the 0.816 scale
Show the answers

(a) They are its altitudes

(b) The Z axis

(c) The angle in a semicircle is 90°

Your turn: Higher Level questions on Axonometric projection.

Higher Level

Asked on 7 of the last 9 Higher Level papers, most recently in 2025. most years

Every paper, year by year

YearWhere it came up
2025A1
2024B3
2023B3
2022Not asked
2021B3
2019B1
2018A1
2017A1
2016Not asked

Links open the State Examinations Commission’s paper for that year.

More Axonometric projection questions

Axonometric projection, 2 marks

In the axes method, what does each side of the axonometric triangle represent?

  1. One of the three axes
  2. A true length of the object
  3. The trace of a plane of reference
Show the answer

The trace of a plane of reference

The picture plane cuts the three planes of reference (plan, elevation and end planes) in three lines that form the triangle. The axes are square to these sides.

Axonometric projection, 3 marks

In a dimetric projection, how are the three angles between the projected axes related?

  1. All three are different
  2. Two of them are equal
  3. All three are equal
Show the answer

Two of them are equal

Two axes are equally tilted to the picture plane, so the view is symmetrical about the third axis. Isometric has all three angles equal; trimetric has all three different.

Axonometric projection, 3 marks

Does drawing the axonometric triangle larger make the finished axonometric view larger?

  1. No: it only moves the picture plane
  2. Yes, in proportion to the triangle
  3. Yes, but only in trimetric
Show the answer

No: it only moves the picture plane

The triangle's shape sets the viewing direction; its size only sets where the picture plane cuts the axes. Parallel projection onto a parallel plane gives the same size view.

Ordinary Level

Asked on 9 of the last 9 Ordinary Level papers, most recently in 2025. banker

Every paper, year by year

YearWhere it came up
2025B2
2024B2
2023B3
2022B1
2021B2
2019B2
2018B3
2017B2
2016B1

Links open the State Examinations Commission’s paper for that year.

More Axonometric projection questions

Axonometric projection, 2 marks

In the axes method, what shape is the axonometric triangle for an isometric projection?

  1. Isosceles with one 90 degree angle
  2. Scalene
  3. Equilateral
Show the answer

Equilateral

In isometric the three axes are equally inclined to the axonometric plane, so the traces of the three reference planes form an equilateral triangle.

Axonometric projection, 3 marks

In the axes method, how is the true shape of a plane of reference found?

  1. Redraw it with 30 degree axes
  2. Fold it flat about a side of the triangle
  3. Project it down onto the ground line
Show the answer

Fold it flat about a side of the triangle

Each reference plane is hinged about one side of the axonometric triangle and rotated flat. True sizes are set out there and projected back.

Axonometric projection, 2 marks

In orthogonal axonometric projection, projectors meet the axonometric plane at what angle?

  1. 90 degrees
  2. 45 degrees
  3. 30 degrees
Show the answer

90 degrees

Orthogonal means at right angles. Parallel projectors strike the axonometric plane at 90 degrees, just as in an ordinary plan or elevation.

Other Design & Communication Graphics (DCG) topics

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