# INTRODUCTION

In this weeks revision blog we look at Geologic Geometry which is the first Applied Geometry topic on the Leaving Certificate Examination paper. It is split into 3 main areas, all of which are usually on the paper.

- Profiles
- Mining Geometry
- Earthen works (Road Geometry)

In a nutshell this topic deals with really world situations where people need to understand and manipulate the earth in order to build infrastructure and find precious metals. This question involves a map which is on the last page of the Section A booklet. This is a vital topic as it is guaranteed to be in your exam along with the other Applied Geometry topics.

The concepts that are used in this topic from the core are:

- Laminar Planes
- Skew Lines

# SYLLABUS LEARNING OUTCOMES

(Leaving Certificate Design and Communication Graphics Syllabus, 2006)

# WHAT YOU NEED TO KNOW

### ORDINARY LEVEL AND HIGHER LEVEL

- Construct profiles using contour maps
- Determine the cut and fill for level roads
- Determine the dip, strike and thickness of strata
- Construct the outcrop profile for strata

### HIGHER LEVEL

- Determine the cut and fill for sloped roads
- Determine the apparent dip of strata
- Solve mining problems requiring the use of skew boreholes

# PRACTICE QUESTIONS

## PRACTICE TEXTBOOK QUESTIONS

(Anderson, 2014)

- P373 Q2 (Profiles)
- P375 Q7 (Mining Geometry Stratum/ Outcrops)
- P375 Q8 (Mining Geometry Stratum/ Outcrops)
- P376 Q10 (Level Road with Curve)
- P377 Q11 (Level Road with Car Park)
- P377 Q12 (Skew Boreholes)
- P378 Q14 (Skew Boreholes with Apparent Dip)
- P378 Q16 (Sloping Road with Bend)
- P379 Q17 (Sloping Road with Car Park)

## PRACTICE EXAM QUESTIONS

### LONG QUESTIONS

- Every Year Section C Question 1
- Part (c)'s are all very important as every year they are different so doing as many as you can will help you problem solve in your Leaving Certificate Examination.

Geologic Geometry is one of the most important questions on the syllabus as it is guaranteed to come up in your examination. Therefore it is vital that you know all you can about the topic so that you can almost guarantee yourself 40+ out of 45 marks in exam.

### 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.