Question 373718
{{{A+B+C=180}}}
.
.
.
{{{A+A[e]=360}}}
{{{B+B[e]=360}}}
{{{C+C[e]=360}}}
.
.
.
{{{180+A[e]+B[e]+C[e]=1080}}}
{{{A[e]+B[e]+C[e]=900}}}
{{{A[e]+(360-B)+(360-C)=900}}}
{{{A[e]+720=900+B+C}}}
{{{A[e]=180+B+C}}}
No, because each exterior angle equals 180 plus the sum of the remaining two interior angles.