Calculate Alpha (α) in Parallel Lines: Using the 70° Angle Relationship

Question

The lines shown below are parallel.

Calculate the size of angle $\alpha$ and indicate the relationship between the two angles.

00:00 Find angle A

00:04 Lines are parallel according to the given data

00:13 Corresponding angles between parallel lines sum to 180

00:20 Let's isolate angle A

00:29 And this is the solution to the question

110, co-interior angles.