Grover and Rosita illustrate and explain the properties of a triangle. Rosita brings over two different-looking triangles to serve as visual aids, and Grover does not consider them to be triangles. He creates an equilateral triangle and states why it is a triangle. Rosita mentions that the triangles she brought in fit his definition of a triangle, causing Grover to realize that there are different types of triangles.

This video pairs a dance about angles, acute and obtuse, to a catchy beat.

This is a short song to help learn the difference between the different types of triangles.

The Bad Man explains more about the three triangles.

The Earthlings consult with Chief about whether or not Sleight O' Hand stole Hacker's recharger key. Chief claims that Sleight looks like a triangle and thus committed the crime, but Inez suggests that there could be other suspects. She states that they should look at the evidence from every point of view because shapes look different at different angles. They revisit the video footage to determine if Sleight O' Hand is still a suspect.