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## PowerPoint Slideshow about ' CIRCUMFERENCE ' - dasan

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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.

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

Now that we have determined the correct formula for each, let’s work the problems.

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