Browse lessons

Teacher info ▼

Using sides to see if triangles are congruent

Explain how the criteria for triangle congruence (ASA, SAS, and SSS) follow from the definition of congruence in terms of rigid motions.

Draw (freehand, with ruler and protractor, and with technology) geometric shapes with given conditions. Focus on constructing triangles from three measures of angles or sides, noticing when the conditions determine a unique triangle, more than one triangle, or no triangle.

https://schoolyourself.org/page/lti/sy/geometry/triangles-sss

Browse lessons