St Colmcille's Community School
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Ellipse & Parabola
Orthographic
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Perspective
3D Drawing & Isometric Projection
Transformation Geometry
Equipment Needed
Short Questions
A-Auxiliary
A-CAD
A-Cutting Planes
A-Developments
A-Ellipse
A-Equal Widths
A-Freehand
A-Graphs
A-Isometric
A-Perspective
A-Plane Figures
A-Points of Contact
A-Projections
A-Rotations
A-Tangents
A-Triangles
Exam Tips
SectionA Study Notes
Long Questions
Q1-Orthographic
Q2-Rotations
Q3-3D Views
Q4-Developments
Q5-Transformations
Q6-Ellipse & Parabola
Exam Revision
Junior Cert Section A
Isometric
There are two types of isometric questions:
Freehand
WIth a ruler
Be careful, if the questions asks for a "freehand pictoral sketch" then you
can't
use a ruler. Other than that the methods are identical.
How to do it
Pictoral
= 3D
Horizontal lines become diagonal
Vertical lines remain vertical
Count the gaps between the dots to work out the length of the lines
Don't forget to
colour or shade
the sketch
Past Exam Questions - Freehand
Worksheets with all the isometric questions can be downloaded to print out below:
A3 Worksheet
A4 Worksheet
Past Exam Questions - With a Ruler
If it
doesn't say freehand,
you're able to use a ruler