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CIRCUMFERENCE. 5 th Grade Miss Cameron’s Class. The circumference of a circle is. The distance around a circle. Hint: Circumference remember circle around. Circumference is a circle’s perimeter. The diameter is the distance across a circle through the center. Vocabulary.

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Presentation Transcript

Miss Cameron’s Class

The distance around a circle

Hint: Circumference remember circle around. Circumference is a circle’s perimeter.

Vocabulary. center.

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

Hint: It is ½ the diameter

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

Pi, not Pie!

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 = 2r

2 x 5cm x 3.14

31.4cm

HINT: You may round 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 r x 3.14

8ft should be used.

C = 3.14 d

122mm should be used.

C = 2 x r x 3.14

17.5 cm should be used.

C = 3.14 x d

122.5mm should be used.

C = 2 x r x 3.14

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

122mm let’s work the problems.

C = 2 x 3.14 x d

17.5 cm let’s work the problems.

C = 3.14 x d

122.5mm let’s work the problems.

C = 2 x 3.14 x r

Area of a circle= let’s work the problems.

The amount of space inside.

r ²

6 m

Another formula let’s work the problems.

• ½ d x

12 ft

Find area let’s work the problems.

9 ft

Find area let’s work the problems.

15 mm

13 cm

Find area let’s work the problems.

19 ft

Circles rap let’s work the problems.

By Miss Cameron

Circles, those tricky circles! Pow!

I said those circles.

Those tricky circles! Pow!

Circumference is perimeter; it’s all the same let’s work the problems.

They just try to trick you with a name game.

Circumference is diameter, the length across

Multiplied by pi

So don’t get lost

Pi is 3.14, a funny number. let’s work the problems.

Rap with me now, & please don’t slumber.

Area for a circle is radius squared.

So half the diameter and make it squared.

Well you know what to do, so do it now. let’s work the problems.

Find circumference and area of a circle. POW!

Circles, those tricky circles. POW!

I said those circles, those tricky circles. POW!