# Transcript: Area of a Triangle

(music plays)

In a colourful TV studio, Robyn stands next to a wall touch screen showing a triangle and a formula. She is in her mid-twenties, with long blond hair. She wears a blue T-shirt with a print that reads "Home Work Zone" and black trousers.

She says HEY, TVO KIDS.

I'M TEACHER ROBYN.

TODAY, WE'RE GOING TO EXPLORE

HOW TO FIND THE ARE OF A

TRIANGLE USING A FORMULA.

IT'S REALLY EASY, REMEMBER THAT

AREA IS THE AMOUNT OF SPACE

A TWO DIMENSIONAL SHAPE TAKES

UP. HERE'S THE FORMULA:

TO FIND THE AREA OF A TRIANGLE,

MULTIPLY THE BASE BY THE HEIGHT

AND DIVIDE THE WHOLE THING

BY TWO.

THE BASE IS THE BOTTOM

OF THE TRIANGLE,

AND THE HEIGHT

IS HOW FAR UP IT GOES.

She clicks on a top menu and an equilateral triangle with a dotted line in the middle appears.

She continues HERE'S AN EXAMPLE: HERE WE'VE

BEEN GIVEN THE NUMBERS,

BUT SOMETIMES, YOU MAY NEED TO

USE A RULER,

OR OTHER MEASURING DEVICE TO

FIGURE OUT THE ANSWER.

WE KNOW OUR FORMULA IS BASE

TIMES HEIGHT DIVIDED BY TWO

NOW, ALL WE NEED TO DO IS PLUG

IN THE NUMBERS.

WE ALWAYS WANT TO MAKE SURE THAT

WE'RE USING OUR UNITS

WHEN REPRESENTING THE BASE AND

THE HEIGHT, IN THIS CASE,

THE BASE IS 12 CENTIMETRES

TIMES SEVEN CENTIMETRES.

WHEN YOU'RE FIGURING OUT

THE AREA OF THE TRIANGLE,

MAKE SURE YOU GO STEP BY STEP.

She uncovers the bottom of the screen to show the answer.

She continues NOW WE KNOW THAT THE AREA OF THE

TRIANGLE IS 84 CENTIMETRES

SQUARED DIVIDED BY TWO.

WE SAY CENTIMETRES SQUARED

BECAUSE NOW WE'RE TALKING ABOUT

TWO DIMENSIONS.

FINALLY, WE DIVIDE 84 BY TWO AND

WE'VE GOT OUR ANSWER.

THE ANSWER IS

42 CENTIMETRES SQUARED.

LET'S TRY ANOTHER EXAMPLE:

HERE, WE CAN SEE THAT THE UNITS

HAVE CHANGED.

NOW, WE'RE TALKING IN METRES.

HOWEVER, THE FORMULA IS THE SAME

WE KNOW THAT THE BASE OF THE

TRIANGLE IS EIGHT METRES

AND THE HEIGHT IS FIVE METRES.

WE START BY MULTIPLYING EIGHT

METRES BY FIVE METRES.

THAT GIVES US

40 METRES SQUARED.

NOW, WE'LL QUICKLY DIVIDE

THAT BY TWO,

AND WE END WITH THE AREA

OF THE TRIANGLE,

WHICH IS 20 METRES SQUARED.

ONCE YOU HAVE THIS FORMULA,

IT'S REALLY SIMPLE. WAY TO GO,

TVO KIDS. SEE YOU NEXT TIME!

In a colourful TV studio, Robyn stands next to a wall touch screen showing a triangle and a formula. She is in her mid-twenties, with long blond hair. She wears a blue T-shirt with a print that reads "Home Work Zone" and black trousers.

She says HEY, TVO KIDS.

I'M TEACHER ROBYN.

TODAY, WE'RE GOING TO EXPLORE

HOW TO FIND THE ARE OF A

TRIANGLE USING A FORMULA.

IT'S REALLY EASY, REMEMBER THAT

AREA IS THE AMOUNT OF SPACE

A TWO DIMENSIONAL SHAPE TAKES

UP. HERE'S THE FORMULA:

TO FIND THE AREA OF A TRIANGLE,

MULTIPLY THE BASE BY THE HEIGHT

AND DIVIDE THE WHOLE THING

BY TWO.

THE BASE IS THE BOTTOM

OF THE TRIANGLE,

AND THE HEIGHT

IS HOW FAR UP IT GOES.

She clicks on a top menu and an equilateral triangle with a dotted line in the middle appears.

She continues HERE'S AN EXAMPLE: HERE WE'VE

BEEN GIVEN THE NUMBERS,

BUT SOMETIMES, YOU MAY NEED TO

USE A RULER,

OR OTHER MEASURING DEVICE TO

FIGURE OUT THE ANSWER.

WE KNOW OUR FORMULA IS BASE

TIMES HEIGHT DIVIDED BY TWO

NOW, ALL WE NEED TO DO IS PLUG

IN THE NUMBERS.

WE ALWAYS WANT TO MAKE SURE THAT

WE'RE USING OUR UNITS

WHEN REPRESENTING THE BASE AND

THE HEIGHT, IN THIS CASE,

THE BASE IS 12 CENTIMETRES

TIMES SEVEN CENTIMETRES.

WHEN YOU'RE FIGURING OUT

THE AREA OF THE TRIANGLE,

MAKE SURE YOU GO STEP BY STEP.

She uncovers the bottom of the screen to show the answer.

She continues NOW WE KNOW THAT THE AREA OF THE

TRIANGLE IS 84 CENTIMETRES

SQUARED DIVIDED BY TWO.

WE SAY CENTIMETRES SQUARED

BECAUSE NOW WE'RE TALKING ABOUT

TWO DIMENSIONS.

FINALLY, WE DIVIDE 84 BY TWO AND

WE'VE GOT OUR ANSWER.

THE ANSWER IS

42 CENTIMETRES SQUARED.

LET'S TRY ANOTHER EXAMPLE:

HERE, WE CAN SEE THAT THE UNITS

HAVE CHANGED.

NOW, WE'RE TALKING IN METRES.

HOWEVER, THE FORMULA IS THE SAME

WE KNOW THAT THE BASE OF THE

TRIANGLE IS EIGHT METRES

AND THE HEIGHT IS FIVE METRES.

WE START BY MULTIPLYING EIGHT

METRES BY FIVE METRES.

THAT GIVES US

40 METRES SQUARED.

NOW, WE'LL QUICKLY DIVIDE

THAT BY TWO,

AND WE END WITH THE AREA

OF THE TRIANGLE,

WHICH IS 20 METRES SQUARED.

ONCE YOU HAVE THIS FORMULA,

IT'S REALLY SIMPLE. WAY TO GO,

TVO KIDS. SEE YOU NEXT TIME!

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