- Oh, hi.

(dog woofs)

Elmo and Tango are investigating a

math mystery!

(magical music)

And Elmo and Tango need your help.

Tango's doggy toy is missing.

(dog whimper)

And it's hidden behind something in the park

shaped like a

triangle.

A triangle is a shape with

one,

two,

three sides

and one

two,

three angles.

(harp playing)

Do you see something that's shaped like a triangle?

(dog barking)

(dog panting)

Oh yeah. Look! That tree shaped is like a triangle.

See it has three sides and three angles.

(dog barking and sniffing)

Hmm, but her toy isn't there.

Let's keep looking.

(dog sniffing and barking)

(Elmo laughing)

A beach ball isn't shaped like a triangle.

A beach ball is round like a circle.

(dog panting)

(dog barking)

Yeah! That rock is shaped like a triangle.

It has three sides

and three angles.

Oh, does Tango see her toy?

(dog barking excitedly)

(fanfare)

Yay! We solved the mystery.

(dog barking)

(Elmo laughing)

Thank you for helping Tango find her doggy toy.

Elmo and Tango couldn't have solved

this math mystery without you.

(Elmo laughing)

(dog howling)

- [Male 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.

- [Male Announcer] Catch the brand new series:

Mecha Builders.

Now streaming on HBO Max.