1.

The sides \[BC,\,\,CA\] and \[AB\] of \[\Delta ABC\] are produced in order to form exterior angles\[\angle ACD,\,\,\angle BAE\]and\[\angle CBF\]. Find\[\angle ACD+\angle BAE+\angle CBF\].

A. \[{{180}^{o}}\]                                  
B.        \[{{270}^{o}}\]                      
C.        \[{{360}^{o}}\]                                  
D.        \[{{540}^{o}}\]
Answer» D.        \[{{540}^{o}}\]


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