
HOMOTHETY AND SIMILARITY  
INTRODUCTION  
This unit deals with some of the basic concepts of homothety (or enlargement) and some formulae connected to Thales' theorem. Rather than rigorous, stepbystep demonstrations, this unit offers the advantage of proving theories and properties in a straightforward manner. To conclude the unit, different examples of similarity in triangles and polygons in general is also focused on, through an interactive approach. There is an introduction to metric relations in a rightangled triangle: the theorem of the sides adjacent to the right angle and the perpendicular height theorem. 

AIMS  

Miguel García Reyes 
Spanish Ministry of Education. Year 2001  
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