# 5 th Grade Miss Cameron’s Class - PowerPoint PPT Presentation

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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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5 th Grade Miss Cameron’s Class

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CIRCUMFERENCE

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.

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!

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 = 2r

2 x 5cm x 3.14

31.4cm

HINT: You may round to the nearest tenth

NOW…Let’s have some fun.

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

3in

C = 2 x r x 3.14

8ft

C = 3.14 d

122mm

C = 2 x r x 3.14

17.5 cm

C = 3.14 x d

122.5mm

C = 2 x r x 3.14

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

3in

C = 2 x 3.14 x r

8ft

C = 3.14 d

122mm

C = 2 x 3.14 x d

17.5 cm

C = 3.14 x d

122.5mm

C = 2 x 3.14 x r

Area of a circle=

The amount of space inside.

r ²

6 m

• ½ d x

12 ft

### Find area

9 ft

Find area

15 mm

• Find area

13 cm

Find area

19 ft

Circles rap

By Miss Cameron

Circles, those tricky circles! Pow!

I said those circles.

Those tricky circles! Pow!

Circumference is perimeter; it’s all the same

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.

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.

Find circumference and area of a circle. POW!

Circles, those tricky circles. POW!

I said those circles, those tricky circles. POW!