Euclid's Elements Book I, Proposition 8: (SideSideSide SSS Congruence)
If two triangles have the two sides equal to two sides respectively, and have also the base equal to the base, they will also have the angles equal which are contained by the equal straight lines. Let ABC and DEF be two triangles having the two sides AB and AC equal to the two sides DE and DF respectively,
namely AB to DE, and AC to DF; and let them have the base BC equal to
the base EF; I say that the angle BAC is also equal to the angle EDF.
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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