1. $$\angle ABC\ $$is an isosceles triangle and $$\ \overline{AB}\ $$=$$ \overline{AC}\ $$= 2a unit $$\ \overline{BC}\ $$= a unit, Draw $$ \overline{AD}\ \bot\ \overline{BC},\ $$and find the length of $$\ \overline{AD}$$





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