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CIRCUMFERENCE. The circumference of a circle is. The distance around a circle. Hint: Circumference remember circle around. First we must define some things about a circle. The radius is the distance from the center of a circle to any point on a circle. Hint: define it as halfway through!.

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Circumference

The circumference of a circle is

The distance around a circle

Hint: Circumference remember circle around


First we must define some things about a circle
First we must define some things about a circle.

The radius is the distance from the center of a circle to any point on a circle.

Hint: define it as halfway through!



Circumference

We use Pi as the measurement to help us find the circumference of a circle.

Pi, not Pie!


Circumference

HINT: Pi =3.14 circumference of a circle.


Circumference

Two formulas are used in finding the circumference of a circle.

WHEN THE CIRCLE HAS A DIAMETER MEASUREMENT, USE THE FOLLOWING FORMULA.

Circumference = d

4in.

3.14 x 4in.

12.6in.


Circumference

When the radius of a circle is given, the following formula should be used.

Circumference = 2 r

2 x 3.14 x 5cm

31.4cm

HINT: Always round your answers to the nearest tenth.


Circumference

NOW…Let’s have some fun. should be used.

Tell me what formula would be used to solve the next five problems.


Circumference

3in should be used.

C = 2 x 3.14 x r


Circumference

8ft should be used.

C = 3.14 d


Circumference

122mm should be used.

C = 2 x 3.14 x d


Circumference

17.5 cm should be used.

C = 3.14 x d


Circumference

122.5mm should be used.

C = 2 x 3.14 x r



Circumference

The answer is: 18.8in let’s work the problems.

3in

C = 2 x 3.14 x r


Circumference

8ft let’s work the problems.

C = 3.14 d

The answer is: 25.1ft


Circumference

122mm let’s work the problems.

C = 2 x 3.14 x d

The answer is: 766.2mm


Circumference

17.5 cm let’s work the problems.

C = 3.14 x d

The answer is: 55cm


Circumference

122.5mm let’s work the problems.

C = 2 x 3.14 x r

The answer is: 76,930mm