## 1st Year Summer Exam Revision

## Short Question TopicsPerspective
Equal widths Bisecting angles & lines Drawing hexagons & pentagons Isometric Graphs |
## Long Question TopicsEllipse
Orthographic Transformations Isometric |

## Perspective

**Key Concepts**:

- Vertical lines remain vertical
- Horizontal lines go to a vanishing point
- Find beginning and end of sloping lines, then join the dots

## Equal Widths

Key Concepts:

If you have a line of unknown or awkward length (125.32mm),

There are two ways to divide up the line (step 2):

If you have a line of unknown or awkward length (125.32mm),

- draw another line that you can easily divide into the amount of sections you need at an angle to the original line
- divide it up
- connect the end of the last division to the end of the original line
- draw lines parallel to the line in step 3 from each point
- the points where these lines meet the original line give you your divisions

There are two ways to divide up the line (step 2):

- use your compass to mark off equal divisions
- make the line a length that is easily divisible, ie, for 7 divisions use a 140mm line

**Very Important**- You MUST you the construction method above, measuring the length and dividing it isn't accurate and will get you**0 marks**.## Bisecting Angles and Lines

This is a technique used within a range of short and long questions. See page XXX in your book for details of how to do this.

## Drawing Hexagons and Pentagons

There are several ways to draw each of these so don't worry if you forget a part of a technique, there's always another option. Usually, using your compass is faster and easier than other methods.

Pentagon (5 sides) -

Hexagon (6 sides -

**Key angles**Pentagon (5 sides) -

**72****degrees**(360 / 5)Hexagon (6 sides -

**60 degrees**(360 / 6)## Isometric (Short Questions)

**Pictoral**= 3D- Horizontal lines become diagonal (at 30 degrees - use the dots)
- 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

Click here for revision questions (note these will have to be printed)

## Graphs

## Ellipse

- Know the circle method for drawing an ellipse
- Practice reading dimensions from a drawing