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Suppose the measure of an exterior of an equiangular triangle is ##(x+15)°##. What is the value of x?

    ##x=105^o##

    An equiangular triangle is a triangle, whose all interior angles are equal.

    As sum of the interior angles of a triangle is ##180^o##, each interior angle is ##60^o##, and

    consequently each exterior angle is ##180^o-60^o=120^o##

    as such ##x+15^o=120^o##

    ##x=120^o-15^o=105^o##