Concept:The teaching method described involves students actively exploring and discovering a mathematical concept (sum of angles in a triangle) through hands-on measurement and analysis, which is a hallmark of the discovery method.
Explanation:1. The teacher gives students triangular paper cuttings and asks them to measure and record the angles.
2. By doing this for multiple triangles, students observe that the sum is always around 180°.
3. This process allows students to discover the rule themselves rather than being told the rule directly.
4. The discovery method (also called the inductive or heuristic method) places the student at the center of learning, encouraging exploration, critical thinking, and better retention.
5. In contrast, a deductive method would present the rule first and then ask students to apply it. An analytical approach focuses on breaking down parts but not necessarily on discovery. A teacher‑centered approach involves passive reception of information.
Answer:The correct option is C. Discovery method.