What is a scale drawing?

Shape

When an object is being designed it is not usually drawn to actual size. Large objects are scaled down onto the page and small objects may be scaled up. This makes it more convenient to pass on information about the object or to discuss the design.

Example

A plot of land is of the shape and measurements below. All the angles are right angles.

Plot of land. 24.9m x 24.1m x 12.8m x 12.6m x 12.1m x 11.5m

The land is to be developed, so to start this a scale drawing is to be made.

A scale that might be used is \(1\,cm\) represents \(1\,m\).

This means that on the scale drawing every metre of real life measurement is represented by a line of 1 centimetre.

The side that is really \(24.9\,m\) long is drawn as \(24.9\,cm\) on the diagram.

The side that is really \(12.6\,m\) long is drawn as \(12.6\,cm\) on the diagram.

The diagram can then be used in starting to plan the development.

Later in the development other scale drawings would be made to show more detail.

Task

Make a scale drawing of the plot of land shown in the example.