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If ext angle is 105 then extend BC there will be supplementary angles then angle B is75 .ext angle is equal to sum of two interior opposite angles is condition therefore angle A and C is equal and it 52.5 degrees

One more thing, just indent the answer so that it would be pleasant while reading it... i don't want to give warnings again and again :).... plz do the indentation .....

Exterior angle of a triangle = Sum of the measures of the two non-adjacent interior angles Exterior angle of a triangle = 105 105/2 = 52.5 Each of these angles is 52.5 degrees.