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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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slide2

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!

slide5

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

Pi, not Pie!

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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.

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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.

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NOW…Let’s have some fun.

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

slide10

3in

C = 2 x 3.14 x r

slide11

8ft

C = 3.14 d

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122mm

C = 2 x 3.14 x d

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17.5 cm

C = 3.14 x d

slide14

122.5mm

C = 2 x 3.14 x r

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The answer is: 18.8in

3in

C = 2 x 3.14 x r

slide17

8ft

C = 3.14 d

The answer is: 25.1ft

slide18

122mm

C = 2 x 3.14 x d

The answer is: 766.2mm

slide19

17.5 cm

C = 3.14 x d

The answer is: 55cm

slide20

122.5mm

C = 2 x 3.14 x r

The answer is: 76,930mm

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