This math topic focuses on solving for unknown angles in triangles with exterior angles that can be conceptualized as spinning or extending outside the triangle. The problems are designed as multiple-choice questions and form an introduction to geometry problem-solving with 2D polygons. Each problem presents a graphical representation of a triangle with marked angles, where learners are challenged to calculate a specific angle labeled as 'X'. The answers offer a range of numerical values reinforcing skills in geometry and angle calculations within the context of triangles.

Work on practice problems directly here, or download the printable pdf worksheet to practice offline.