The missing reasons in Wong's argument will be:
Reason 1: an alternate exterior angle with one of the angles in the triangle
Reason 2: vertical angles with the other two interior angles in the triangle
Recall:
- When you add all the three interior angles of a triangle together, it will always give you 180° (sum of triangle).
- Vertical angles have the same angle measure.
- Alternate exterior angles formed outside the the lines cut by a transversal are congruent.
Angle a in the diagram attached below is an alternate exterior angle and it will be equal to the exterior angle formed by lines m, x, and y.
Angles b and c are both vertical angles, and they will be equal to each of the angles they are directly opposite to each of the interior opposite angles in the triangle.
If we add all three angles, they should give us 180°. This therefore means that:
m∠a + m∠b + m∠c = 180°
Therefore, the missing reasons in Wong's argument will be:
Reason 1: an alternate exterior angle with one of the angles in the triangle
Reason 2: vertical angles with the other two interior angles in the triangle
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