Scales and their uses

Scales help you draw large objects on small paper or enlarge tiny details. A plain scale shows measurements in one direction only, like measuring a 100-meter football field on your drawing sheet. A diagonal scale is more precise because it adds diagonal lines, letting you read measurements down to smaller units—useful when drawing an architectural plan of a Lagos building where accuracy matters.

The scale of chords helps you draw angles accurately without a protractor. Imagine designing a circular component for a factory; you'd use chord scales to mark exact angles around the circle.

Think of it this way: if Nigeria's map is 1cm to 50km, that ratio is your scale. Diagonal scales work the same way but give finer detail by using those diagonal lines.