Identify the given information
Identify what must be proved
Draw and label the diagram
Mark known sides, angles, and relationships
List relevant definitions, postulates, and theorems
Use logical steps to connect the givens to the conclusion
Justify each step with a reason
Use congruence or similarity when applicable
Use angle relationships such as vertical angles, complementary angles, supplementary angles, and parallel line angle rules
Use triangle properties such as angle sum, side-angle relationships, and special triangle rules
Use coordinate geometry when helpful
Use algebra to solve for unknown measures
Write the proof in a clear format
Check that every statement has a valid reason
Verify that the final statement matches what was required to prove