Not necessarily, because if b = c = 179°, then both requirements b < 180° and c < 180° are met. However, b and c cannot be measures of 2 interior angles of a triangle because just those two angles alone have sum of measures 358°, and the sum of the measures of all three interior angles of a triangle must have sum of only 180°. Two of them can't have sum of measures 358° and yet all three have sum of only 180°. Edwin