[school bell rings]

A stick figure teacher stands in a classroom next to an old TV set and a chalkboard that reads "Shapes" and shows a triangle, a square and a rectangle.

He says OKAY, CLASS, TODAY WE
ARE GOING TO FIGURE OUT
RIGHT, ACUTE AND
OBTUSE TRIANGLES.
CAN ANYONE TELL ME WHAT
KIND OF TRIANGLE IS
ON THE BOARD?
HMM, NO?
I'LL GIVE YOU A HINT.
WHEN THIS TRIANGLE
WALKS INTO A ROOM
EVERYONE SAYS "MY,
WHAT A CUTE TRIANGLE."

[class reacting]

The teacher says ALL RIGHT THEN, MAYBE
WE'LL JUST WATCH A VIDEO.

He turns on the old TV.

(music plays)

As a triangle appears on screen, a woman sings
THERE ARE THREE ANGLES
IN EVERY TRIANGLE
AND THOSE ANGLES ADD
UP TO 180 DEGREES...

Labels on each angle of the triangle show that they measure 60º, 70º and 50º.

The song continues
DEPENDING ON THE
TYPES OF ANGLES
WE CAN NAME THAT TRIANGLE
ARE YOU READY TO LEARN?
LISTEN UP, PLEASE...

The triangle shifts in shape to form one with a 90º angle and two narrower angles.

The song continues
A RIGHT TRIANGLE
HAS ONE ANGLE
THAT'S EXACTLY
PRECISELY 90 DEGREES
YES, A RIGHT TRIANGLE
HAS ONE 90-DEGREE ANGLE
ARE YOU READY TO LEARN?
HAVE A LOOK AT THESE

(music plays)

Now a different triangle appears. It has one angle that is greater than 90º.

The song continues
AN OBTUSE TRIANGLE
HAS ONE ANGLE
THAT IS MORE THAN 90 DEGREES...

A label shows that the angle measures 110º.

The song continues YES, AN OBTUSE TRIANGLE
HAS ONE WIDE ANGLE
ARE YOU READY TO LEARN?
HAVE A LOOK AT THESE...

(music plays)

Now another triangle appears. Labels show that its angles measure 50º, 60º and 70º.

The song continues
AN ACUTE TRIANGLE HAS
ALL THREE ANGLES
THAT ARE LESS
THAN 90 DEGREES
YES, AN ACUTE TRIANGLE
HAS THREE SMALLER ANGLES
ARE YOU READY TO LEARN?
HAVE A LOOK AT THESE...

(music plays)

The song continues
RIGHT, OBTUSE, ACUTE
RIGHT, OBTUSE, ACUTE
RIGHT, OBTUSE, ACUTE.

The song ends and the stick figure teacher turns off the old TV.

He says SO IF YOU KNOW THE
ANGLES OF A TRIANGLE,
YOU CAN FIGURE OUT WHAT
KIND OF TRIANGLE IT IS.
WHAT'S 3 TIMES 30?
90, YOU'RE RIGHT.
ANGLE, GET IT.
3 TIMES 30 EQUALS 90
AND A RIGHT ANGLED TRIANGLE
HAS A 90-DEGREE ANGLE.
AH, HA, HA!
YOU'RE RIGHT, ANGLE!

[class booing]

The teacher says DON'T BE SO OBTUSE.

[school bell ringing]
[children cheering]

An end slate shows the TVO Kids logo.