Triangles are congruent <=> they have exactly the same three sides they have exactly the same three angles they have exactly the same two angles (the third angle is deducted)
Harvey Littleman
Triangles are similar <=> they have the same shape, but can be different sizes the sides are proportional : AB/A’B’=AC/A’C’=BC/B’C’ (SSS) two angles are equal (AA) two sides are proportional and the angles between them are equal (SAS)
Similar triangles
From Gogeometry : Using : Area of a triangle Pythagoras Define O intersection of AE and HD and P intersection of BF and GC ABE is congruent to CBF by rotation of pi/2 => <DNP=<FPC=<NOM=<PME=90° Define x=OA and y=OH Define S1=[AOH]= x y /2 [AOH]= [HOB]= [BME]= [EMC]= [CPF]= […]
