Download this free PDF worksheet from STEM Scholars Hub to review and practice essential triangle concepts and postulates, including the Triangle Angle Sum Postulate, the Exterior Angle Theorem, and key properties of triangle types. Students will solve for missing angles, use algebra within triangles, classify triangles by sides and angles, and apply foundational postulates that describe how triangles behave.

This worksheet is designed for students, teachers, and parents/guardians to support learning in geometry, triangle relationships, and reasoning with triangle postulates. Perfect for classwork, homework, small groups, tutoring, test prep, or independent practice.

For a full lesson presentation, the PowerPoint/video discussion for this topic is also available in the Video/PPT Resources page on this website.