Use the triangle angle some theorem to find the largest angle in a triangle with angle measures
of 40°, 60°, and 80°.
According to the triangle angle sum theorem, the sum of the three angles in a triangle is always 180°.
Let x be the largest angle in the triangle.
Therefore, 40° + 60° + 80° + x = 180°
180° - 180° = x
x = 100°
Therefore, the largest angle in the triangle with angle measures of 40°, 60°, and 80° is 100°.