Nooooo

Let  a  and  b  be the measures of the two other angles of the triangle.

the sum of the interior angles in a triangle  =  180°

a + b + (a + b)  =  180°

2(a + b)  =  180°

a + b  =  90°

the measure of the smallest exterior angle  =  180° - the measure of the largest interior angle

the measure of the smallest exterior angle  =  180° - ( a + b )

the measure of the smallest exterior angle  =  180° - 90°

the measure of the smallest exterior angle  =  90°

There are a theorem witch say:

An exterior angle of a triangle is equal to the sum of the other two angles of the triangle.

So the measure of the smallest exterior angle of the triangle equals to the sum of the other two angles of the triangle.