Constructions and loci · Year 7
In Year 7 you learn: drawing triangles with a ruler and protractor.
Constructions are accurate drawings made with a ruler and compasses only. A locus (plural loci) is the set of all points that follow a rule, such as “3 m from a post” or “the same distance from two points”, and is drawn with the same constructions.
Key facts
- Triangle from three sides: draw one side, then arcs of the other two lengths from its ends.
- A fixed distance from a line makes parallel lines (with semicircles round the ends of a line segment).
- Leave construction arcs showing: they are your working.