Step by step
The question
Question: find out if the two lines are parallel.
The co-interior angles are 95° and 95°.
1 Name the angle pair
A line crosses two other lines.
It is called a transversal.
Our two angles are between the lines, on the same side of the transversal: co-interior angles.
Together they make a C shape.
2 Use the parallel test
Parallel lines make co-interior angles add up to 180°.
And if they add up to 180°, the lines are parallel.
So we add them: 95 + 95 = 190.
95 + 95 = 190
190 is not 180.
They do not add up to 180°.
190 ≠ 180
Careful!
Co-interior angles are not equal when the lines are parallel.
They add up to 180°.
Careful: not 95 = 95, so parallel ✗
So the lines are not parallel.
Answer: = not parallel
If we carry the lines on, they would meet.
Look at the picture: the top line is turned.
Let's look back.
First: name the angle pair.
Last: use the parallel test.
Answer
Answer: = not parallel