Euclid's Elements Book I, Proposition 4: (SideAngleSide SAS) If two triangles have two sides equal to two sides respectively, and have the angles contained by the equal sides also equal, then the two triangles are
congruent
Let ABC and DEF be two triangles having the two sides AB and AC equal to the two sides DE and DF respectively,
and the angle BAC equal to the angle EDF. I say that the base BC also
equals the base EF, the triangle ABC equals the triangle DEF, and the
remaining angles equal the remaining angles respectively.
Construction
The Elements: Books IXIII
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Education In its broad sense, education refers to any act or experience that has a formative effect on the mind, character, or physical ability of an individual...In its technical sense education is the process by which society, through schools, colleges, universities, and other institutions, deliberately transmits its cultural heritageits accumulated knowledge, values, and skillsfrom one generation to another. George F. Kneller, Introduction to the Philosophy of Education (New York: John Wiley and Sons, 1971.) 
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