Engage your students with this interactive geometry lesson on postulates, definitions, and theorems designed for 8th–12th grade math. This resource helps students clearly distinguish between undefined terms, definitions, postulates, and theorems while building a strong foundation for geometric reasoning. Students will: Explore undefined terms (points, lines, planes) through a GeoGebra lab Learn how to construct rays, segments, circles, and intersecting lines to illustrate postulates Compare a