Teacher Troy stands in front of a blackboard with 3 different types of angles drawn on it: acute, right, and obtuse.

Teacher Troy is in his thirties, bald and with a shadow of a beard. He wears a blue Homework Help T-shirt.

He says HI TVO
KIDS.
THIS IS
TEACHER TROY AND
I'M GOING TO TALK TO
YOU ABOUT ANGLES.
MATH IS
THE STUDY OF
RELATIONSHIPS AND
ANGLES TALK
ABOUT THE
RELATIONSHIP THAT
OCCURS BETWEEN LINE
SEGMENTS
WHEN
THEY MEET.
FOR EXAMPLE WHEN
YOU LOOK AT
YOUR ARM WHERE
YOUR ELBOW MEETS
IT'S SEPARATES YOU
ARM INTO TWO PARTS.
THAT FORMS
AN ANGLE WHEN YOU
BEND YOUR
ARM.
SO WHAT
WE'RE GOING TO DO,
WE'RE GOING TO LOOK
AT DIFFERENT
TYPES
OF ANGLES.
THERE ARE THREE MAJOR
TYPES OF ANGLES.
WE HAVE AN
ACUTE, RIGHT, AND
OBTUSE ANGLES.
RIGHT NOW WE'RE
GOING TO TALK
ABOUT
RIGHT ANGLES.
RIGHT ANGLES, AS
YOU'LL SEE
MEET AND FORM
WHAT'S COMMONLY
LOOKED AT UPON
AS A CORNER.
SO IF YOU LOOK
AT SQUARES AND
RECTANGLES,
YOU'RE GOING
TO SEE A
RIGHT ANGLE
ALL THE TIME.
THERE'S USUALLY FOUR
RIGHT ANGLES
IN A RECTANGLE,
FOUR IN A SQUARE.
SO WHAT WE'LL DO
FOR EXAMPLE,
OF COURSE YOU'RE
GOING TO USE A RULER
WHEN YOU'RE DRAWING
A LINE.
WHEN YOU HAVE
ONE STRAIGHT LINE
SEGMENT A RIGHT
ANGLE ACTUALLY
MEETS AND FORMS
LIKE THE LETTER L.
AND IF I WERE TO
DRAW THAT
THAT'S
ONE HERE,
THE ANGLE IS ACTUALLY
RIGHT HERE.
WE USE A LITTLE
SQUARE TO SHOW WHERE
THE TWO LINE SEGMENTS
MEET.
IF I WERE TO
DRAW ANOTHER RIGHT
ANGLE OVER HERE,
JUST TO GIVE
YOU AN EXAMPLE,
AS YOU CAN SEE
THAT GIVES YOU
A SQUARE.
AND THAT
FORMS ANOTHER
RIGHT ANGLE
RIGHT HERE.
AND IF YOU LOOK
AT IT THERE'S
ONE HERE, AND
ONE HERE GIVING US
FOUR RIGHT
ANGLES.
SO, ONCE
AGAIN WHEN YOU'RE
LOOKING AT ANGLES
OF COURSE YOU
START FROM
BEING STRAIGHT THEN
YOU GO HALF
WAY UP,
THAT GIVES YOU
THE RIGHT ANGLE,
THAT GIVES YOU
A CORNER,
SOMETHING TO
LOOK FOR WHENEVER
YOU'RE WORKING
WITH
RECTANGLES
AND SQUARES.
I'M TEACHER TROY AND
I HOPE THAT HELPS.