De Leon, Joel P, <br/><br/>Development and validation of manipulative learning activities  -  December 2015  - 101 leaves :  illustrations ;  28 cm <br/><br/>Thesis <br/><br/><label>Subjects--Topical Terms: </label><br/>Geometry--Study and teaching.<br/><br/><label>LC Class. No.: </label>QA461  / .D377 2015