Geometry for Elementary School/Copying a triangle

Copying a line segment Copying a triangle Copying an angle In this chapter, we will show how to copy a triangle to other triangle . The construction is an excellent example of the reduction technique – solving a problem by solution to a previously solved problem. The construction Construct a triangle from the sides of : , , and get . Claim The triangles and are congruent. Proof , , are sides of the triangle and therefore obey the triangle inequality. Therefore one can build a triangle whose sides equal these segments. The sides of the triangle and are equal. Due to ../The Side-Side-Side congruence theorem/ the triangles and congruence. it:Geometria per scuola elementare/Copia di un triangolo