Answer:Here we assume that m and n are parallel.Then the true statements are:m∠2 = 20°.You can see that the same ray cuts the two parallel lines, in one the angle formed in the left side is 20°, then the same must happen for the other line, then the measure of angle 2 is equal to 20°.m∠3 = 100°,We will have that:m∠2 + m∠3 + m∠4 = 180°.We know that m∠2 = 20°.And if you look at m∠4, you can see that the same ray that defines it, also defines a 60° angle in the line n, then m∠4 = 60°.then we have:20° + m∠3 + 60° = 180°m∠3 = 180° - 60° - 20° = 100°.m∠2 + m∠4 = 80°.This can be proved using the same reasoning as above....

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