1 : n informs the user that one unit on the scale drawing represents a certain number (n) units in real life. For example, a scale of 1 : 500 means that 1 cm on the scale drawing represents 500 cm ...

Save guides, add subjects and pick up where you left off with your BBC account. It is not always possible to draw objects, such as a building, using the real-life measurements, as they are too big ...