Alternate Angles Facts:

• Alternate Angle comes in pairs, and each angle making up the pair is congruent.

• Alternate Angles are named based on where they are located:

• If located between the parallel lines ( 3, 4, 5, and 6), they are called Alternate Interior Angles.

The Alternate Interior pairs are: 3 and 5, 4 and 6

• If located outside (above and below; 1, 2, 7, and 8) the parallel lines, they are called Alternate Exterior Angles

The Alternate Exterior pairs are: 1 and 7, 2 and 8

• We can often spot interior alternate angles by drawing a Z shape

Use the animation below to study the difference between the two pairs.

Alternate Interior & Exterior Angles Animation