Focus Question: What is a transversal and what information does it give you about angles?

- “What does parallel mean?” Draw two parallel lines on the board.
- “If I draw a line that intersects both of these parallel lines I have drawn a transversal.”
- Number the angles from 1-8.
- Have students discuss anything they notice about the angles.
- Students share back observations, write some down.
- Establish that some angles have to be the same size. Which ones look the same?
- Have students give a pair and then write down the vocabulary name for them.
- After that, give one angle a measure and have students try to figure out all the others.
- Have students give the steps to justify what angle is using a different angle that does not have the same measure. Emphasize the use of supplementary.
- Students then practice from workbook p. 374-8

## So, what do you think ?