the adjoining figure has been obtained by using two triangles. prove that /_ A+/_ B+ /_C+ /_D+ /_E+ /_F=360
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in triangle ACE
sum of all angles is 180------1
in triangle BDF sum of all angle is 180---------2
from eq 1 and 2
A+B+C+D+E+F=360.
hope it helps.........
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