are alternate interior angles supplementary or congruent
Alternate Exterior Angles. When two lines are crossed by another line (called the Transversal): The pairs of angles on opposite sides of the transversal but outside the two lines are called Alternate Exterior Angles. In the example, these are Alternate Exterior Angles: a and h. If you can think of even one way to form congruent alternate interior angles without the two lines being parallel, then it is false. If there is no way to do that, then it is true. When two lines are crossed by another line (called the Transversal): The pairs of angles on opposite sides of the transversal but outside the two lines are called Alternate Exterior Angles. In the example, these are Alternate Exterior Angles: 1  a and h.  b and g. When two lines are crossed by another line (called the Transversal): The pairs of angles on opposite sides of the transversal but inside the two lines are called Alternate Interior Angles. In this example, these are Alternate Interior Angles: 1  c and f.  d and e. Alternate Interior Angles. The pairs of angles on opposite sides of the transversal but inside the two lines are called Alternate Interior Angles. To help you remember: the angle pairs are on Alternate sides of the Transversal, and they are on the Interior of the two crossed lines. The pairs of angles on opposite sides of the transversal but outside the two lines are called Alternate Exterior Angles. To help you remember: the angle pairs are on Alternate sides of the Transversal, and they are on the Exterior of the two crossed lines. Given two parallel lines and a transversal, alternate interior angles are congruent. The key here is that you are told the two lines are parallel, and you have learned that the relationships between the angles created by the intersection of the transversal line and the two parallel lines. When two lines are cut by a transversal, the pair of angles formed interior of the two lines and on the opposite of the transversal is called Alternate Interior Angles. If two parallel lines are cut by a transversal, the alternate interior angles are congruent. In the figure shown, l is the transversal that cut the pair of lines. Angles a and d and angles b and c are alternate interior angles. A. 120o. When two lines are crossed by another line (called the Transversal): The pairs of angles on opposite sides of the transversal but inside the two lines are called Alternate Interior Angles. In this example, these are Alternate Interior Angles: c and f. The definition of parallel is that the sum of the angles on each side of the transversal of two lines is two right angles. From this we can show that the alternate interior angles are congruent. In our case, we have that the alternate interior angles are congruent, that is, we have that there are two pairs of alternate interior angles that are congruent, and that together one angle from each pair forms a straight angle, as you go along the lines.
Congruent