Use a stretched Slinky to model sound waves moving through a material. When you squeeze the Slinky’s coils together at one end (compression), this causes the coils in front of them to spread out (expansion). When the squeezed coils are released they spread out and squeeze the coils in front of them together.

## Answers ( )

Answer:The pairs of alternate interior angles are: ∠3,∠5 and ∠2,∠8.