# Optical Illusion: Are they parallel?

- Author:
- Rebecca Chisholm

## Analyzing Hering's Optical Illusion

In order to determine if the lines are parallel, we want to show that a pair of corresponding angles are congruent.

**Step 1:**Identify a pair of corresponding angles to measure**Step 2:**Find the measurement of the angles using the angle measure tool in the tool bar. It is located next to the arrow. *Click on the angle measure in the toolbar (the angle measure tool will show up again so click on it) *Then, click on the three letters in the same order you would name the angle. *If the angle measure is not the interior angle, undo and change the order in which you are selecting points)**Step 3:**Click on the arrow in the toolbar, then select A to move the transversal and analyze what happens to the corresponding angles.## Are things as they appear?

## What did you do???

Choose the appropriate conditional statement for correct order of the activity above.

2.) Look at the conditional statements above, what is the relationship between the two.