EXTERIOR ANGLE INEQUALITY THEOREM EXTERIOR ANGLE THEOREM OF A TRIANGLE Triangle Similarity (SAS Similarity Theorem, SSS Similarity Theorem, AA Similarity Theorem Inquiry-Based Modular Instruction in Geometry RANGE OF THE POSSIBLE MEASURES OF THE THIRD SIDE OF A TRIANGLE Detailed Lesson Plan in SSS Postulate EASE Module 2 Triangle Congruence EASE Module 3 Triangle Congruence PROBE Triangle Congruence