Sharmaine stands next to a big touch screen showing a protractor. She is in her mid-thirties, with black hair in a ponytail. She wears a blue T-shirt with a print that reads "Home Work Zone."

Sharmaine says HI TVO
KIDS.
I'M
TEACHER SHARMAINE
AND WE'RE GONNA LOOK
AT ANGLES TODAY.
SOMETIMES WE
GET CONFUSED
BECAUSE THERE'S
SO MANY DIFFERENT TYPES.
LET'S TAKE A CLOSER LOOK
AT THEM NOW.
BUT BEFORE WE CAN
REALLY FOCUS ON ANGLES
WE HAVE TO HAVE THE
RIGHT MATH TOOLS
TO BE ABLE TO
CLASSIFY THEM.
THE MATH TOOL THAT
WE USE FOR ANGLES
IS THE
PROTRACTOR.
A PROTRACTOR
HELPS US TO
CLASSIFY ANGLES
AND IT HAS
DIFFERENT NUMBERS
ON IT THAT WE USE
TO MEASURE THE ANGLE.
IT'S A MEASURING
TOOL.
LET'S GIVE IT A TRY.
THE FIRST ANGLE
THAT WE'RE GONNA LOOK AT
IS AN ACUTE ANGLE.
AN ACUTE ANGLE
IS LESS THAN 90 DEGREES.

She uses a blue marker to circle the center of the protractor.

She continues SO IT HAS TO BE LESS
THAN THIS POINT
RIGHT HERE ON
OUR PROTRACTOR.
IT'S AN ACUTE ANGLE.
IT'S CUTE 'CAUSE IT'S
A LITTLE BIT SMALLER.
HERE'S ONE.
LET'S SEE IF IT
FITS ON OUR PROTRACTOR.
WANT TO MAKE SURE
THAT THE
VERTEX IS
LINED UP.

She drags an angle and places it over the protractor.

She continues AND WE WANT TO MAKE
SURE THAT IT'S
LESS THAN
90 DEGREES.
IS IT?
IT STARTS HERE
AND IT ONLY GOES TO HERE.
DEFINITELY LESS THAN
90 DEGREES.
SO IT'S DEFINITELY
AN ACUTE ANGLE.
LET'S TRY
ANOTHER ONE.
RIGHT ANGLES ARE EXACTLY
90 DEGREES.
THAT MEANS
THAT ONE OF THE RAYS
HAS TO TOUCH
90 DEGREES.
HERE'S AN ANGLE HERE
LET'S SEE IF IT WORKS.
MAKE SURE THAT CORNER
HITS RIGHT ON THE
MIDPOINT OF THE
PROTRACTOR
AND THE LINES
MATCH UP.
HEY DOES THAT
RAY ACTUALLY HIT 90 DEGREES?
IT DOES,
DEFINITELY A RIGHT ANGLE.
IT ALMOST FORMS
A SQUARE.
LET'S MOVE ONTO
ANOTHER ONE.

She clicks on a down menu and continues AN OBTUSE ANGLE.
OBTUSE ANGLES ARE
LARGER THAN 90 DEGREES.
THEY'RE WIDE.
SO WE HAVE TO
MAKE SURE THAT
IT GOES PAST 90 ON
EITHER SIDE
DEPENDING ON WHERE
YOU START.
HERE'S AN
ANGLE.
LET'S GIVE
IT A TRY.
LINING UP THOSE
CORNERS AS BEST WE CAN.
THERE.
HERE'S THE ZERO
LINE
AND IT GOES
PAST THE 90
THIS IS ALMOST
TO 130 DEGREES.
DEFINITELY WIDE,
DEFINITELY AN OBTUSE ANGLE.
WAY TO GO.
LET'S TRY ANOTHER
ONE.
STRAIGHT ANGLES.
STRAIGHT ANGLE HAS TO
BE EXACTLY 180.
IT'S ALMOST LIKE
A STRAIGHT LINE.
IT IS A STRAIGHT
LINE.
HERE'S ONE
HERE
LET'S SEE IF IT FITS
ON OUR PROTRACTOR.
SEE THERE'S A
MIDPOINT
THERE ON
OUR LINE.
WE'RE GONNA PUT
THAT RIGHT ON
THE MIDPOINT OF
OUR PROTRACTOR.
HERE WE GO
HEY, IS THAT EXACTLY
180?
DEFINITELY A
STRAIGHT ANGLE.
SO THERE YOU
HAVE IT.
THERE'S FOUR
DIFFERENT TYPES OF ANGLES.
THERE'S STRAIGHT
ANGLE,
AN OBTUSE ANGLE,
WHICH IS REALLY WIDE.
THERE'S ACUTE
ANGLE
WHICH IS CUTE
'CAUSE IT'S LESS THAN 90.
AND WE HAVE THE RIGHT
ANGLE WHICH IS EXACTLY AT 90.
SO NOW YOU KNOW ABOUT
ANGLES.
THANKS VERY MUCH,
TVO KIDS.
THIS IS TEACHER SHARMAINE.