- Oh, hi!

Elmo and Tango are investigating a math mystery!

Elmo and Tango are looking for Slimy the Worm

and you can help us find him.

Slimy is hiding behind something

shaped like a rectangle.

A rectangle has two short sides and two long sides

and one, two, three, four angles.

Come on!

Let's find Slimy.

Hmm, now where could he be?

Hmm, that ball is round like a circle.

Nice try, Tango, but that's not a rectangle.

(Tango barks)

Slimy does like coloring.

Is Slimy behind Elmo's coloring book?

Elmo's coloring book has two short sides

and two long sides and one, two, three, four angles.

It's a rectangle!

But Slimy isn't here.

We need to keep looking.

Elmo thinks we're close.

Come on, Tango.

(Tango barks)

Hey, this planter looks like a rectangle too.

It's got two short sides, two short sides,

and one, two, three, four angles.

Yep, that's a rectangle all right.

Is Slimy behind here?

(laughs) There's Slimy.

Elmo's so happy to see you.

(Tango barks)

And Tango is too.

We solved the mystery!

Thank you for helping us.

We couldn't have done it without you.

Bye bye.

Elmo loves you!

- [Announcer] Meet the Mecha Builders.

Mecha Abby, Mecha Elmo, and Mecha Cookie are here

to save the day.

- We did it!

We solved the problem.

- [Narrator] Catch the brand new series, "Mecha Builders",

now streaming on HBO Max.