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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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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!



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

Pi, not Pie!


HINT: Pi =3.14 circumference of a circle.


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.


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.


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

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


3in should be used.

C = 2 x 3.14 x r


8ft should be used.

C = 3.14 d


122mm should be used.

C = 2 x 3.14 x d


17.5 cm should be used.

C = 3.14 x d


122.5mm should be used.

C = 2 x 3.14 x r



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

3in

C = 2 x 3.14 x r


8ft let’s work the problems.

C = 3.14 d

The answer is: 25.1ft


122mm let’s work the problems.

C = 2 x 3.14 x d

The answer is: 766.2mm


17.5 cm let’s work the problems.

C = 3.14 x d

The answer is: 55cm


122.5mm let’s work the problems.

C = 2 x 3.14 x r

The answer is: 76,930mm


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