High school Design and Technology students are often required to have the technical drawing skill to construct basic geometric shapes. This article explains how to construct triangles using only a compass and straightedge (such as set square or ruler).
How to construct a triangle when given three sides
- Draw the first side of the triangle AB;
- Scribe arcs of radius of each side length from each end;
- Draw the final two sides of the triangle to point C, where the two arcs intersect.
- If constructing an isosceles triangle, both arcs will be the same radius.
How to draw an equilateral triangle when given one side
- Draw side AB;
- Scribe arcs from each end of the line, radius = side length;
- Draw the final two sides of the triangle to the point where the arcs intersect.
Amiria has a Bachelor of Architectural Studies, Bachelor of Architecture (First Class Honours) and a Graduate Diploma of Teaching. She is a CIE Accredited Art & Design and Design & Technology Coursework Assessor. Amiria now teaches Art, Design & Technology at ACG Parnell College.