# INTRODUCTION

This week we will be revising the Cube and the Tetrahedron. These are two important shapes as they have unique characteristics and a number of specific constructions that you need to know. This topic has come up in Section A in the past.

# SYLLABUS LEARNING OUTCOMES

(Leaving Certificate Design and Communication Graphics Syllabus, 2006)

## Orthographic Projection

## WHAT YOU NEED TO KNOW

### ORDINARY LEVEL AND HIGHER LEVEL

- Construct the Orthographic Views of cubes and tetrahedrons given varying amounts of information.

### HIGHER LEVEL

- Determine the inscribing and circumscribing spheres for cubes and tetrahedrons.

# PRACTICE QUESTIONS

## PRACTICE TEXTBOOK QUESTIONS

(Anderson, 2014)

- P38 Q9
- P38 Q10
- P38 Q11

## PRACTICE EXAM QUESTIONS

### SHORT QUESTIONS

- 2016 HL A-4
- 2013 HL A-1
- 2011 HL A-1

Drawing cubes and tetrahedrons require specialised techniques but if you understand the geometry in them they can be very straight forward marks in your Leaving Certificate exam. If you have any questions please leave a comment below.

### REFERENCES

Leaving Certificate Design and Communication Graphics Syllabus. (2006). Dublin: The Stationary Office.

Anderson, D. (2014). *Graphics in Design and Communication: One Volume Edition*. Dublin: Gill & Macmillan.