It looks like this,… Not like this,…

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March 14 is National Pi Day

Transcript of It looks like this,… Not like this,…

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March 14 isNational

Pi Day

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What is pi?

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Pi is a math

symbol

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It looks like this,…

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Not like this,…

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We use

pi in

Geometr

y

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to find the area and

circumference of a circle

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Pi means

exactly

22/7

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…but we round pito 3.14

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Do you know why we

celebrate National Pi Dayon March 14?

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…because it

is also a

famous

person’s

birthday,…

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Albert Einstein

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He was a very

famous scientist

and

mathematician.

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He did a lot of

stuff and was

really, really,

REALLY smart!

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Referring to his birthday as

“Pi Day” is a good way to

honor his memory!

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3.14Get it?

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Pi Day is celebrated on March 14th (3/14)

around the world.Pi is the word for the

Greek letter “π.”

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Pi has been calculated to over one trillion digits beyond its

decimal point. As an irrational number, it

will continue infinitely without repetition or

pattern.

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Let’s learn

some things

about pi,

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By holding hands and making a circle, these children are demonstrating circumference.

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Let’s practice,…C=πdC=3.14x8C=25.12

So, the circle’scircumference is 25.12cm.

(diameter)(8

centimeters)

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Now you try,…A circle has a diameter of 10 centimeters. What is the circumference?

C=πd

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C=πd

C=3.14x10

C=31.40

So, the circle’scircumference is

31.40cm.

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Pi is pretty cool, but you can do more than just

find the circumference.

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You can use pi to find

the area of a circle

too!

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But what is area

you ask?

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Area is all of the

“filling” on the

inside of a

shape.

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It is kind of like finding out how

much new carpet you

would need for your bedroom.

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So how do we

use pi to find

out the area of

a circle?

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First, you need

to know the

radius of the

circle.

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What is

a

radius,

you ask?

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A radius

is HALF

of the

diameter.

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It takes

2 radii

to make

1

diameter

.

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Let’s practice,…

A=πr2

A=3.14x62

A=3.14x6x6

A=113.04cm2

So, the area of the circle is 113.04cm2.

6 cmradius

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Now you try,…A circle has a radius of 4 centimeters. What is the area of the circle?

A=πr2

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A=πr2

A=3.14x42

A=3.14x4x4A=50.24cm2

So, the area of the circle is 50.24cm2.

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Pi is not that

hard to use in

an equation!

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You just have

to know the

circle’s “slices”

and then

multiply.

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Diameter

&

Radius

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It is not

that hard!

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Pi

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Anybody can

learn to use pi!

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