5 th grade miss cameron s class
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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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5 th grade miss cameron s class

CIRCUMFERENCE

5th Grade

Miss Cameron’s Class


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.


5 th grade miss cameron s class

The diameter is the distance across a circle through the center.


Vocabulary

Vocabulary.

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

Hint: It is ½ the diameter


5 th grade miss cameron s class

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

Pi, not Pie!


5 th grade miss cameron s class

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.


5 th grade miss cameron s class

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


5 th grade miss cameron s class

NOW…Let’s have some fun.

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


5 th grade miss cameron s class

3in

C = 2 x r x 3.14


5 th grade miss cameron s class

8ft

C = 3.14 d


5 th grade miss cameron s class

122mm

C = 2 x r x 3.14


5 th grade miss cameron s class

17.5 cm

C = 3.14 x d


5 th grade miss cameron s class

122.5mm

C = 2 x r x 3.14


5 th grade miss cameron s class

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


5 th grade miss cameron s class

The answer is: 18.8in

3in

C = 2 x 3.14 x r


5 th grade miss cameron s class

8ft

C = 3.14 d

The answer is: 25.1ft


5 th grade miss cameron s class

122mm

C = 2 x 3.14 x d

The answer is: 766.2mm


5 th grade miss cameron s class

17.5 cm

C = 3.14 x d

The answer is: 55cm


5 th grade miss cameron s class

122.5mm

C = 2 x 3.14 x r

The answer is: 76,930mm


5 th grade miss cameron s class

Area of a circle=

The amount of space inside.

r ²

6 m


Another formula

Another formula

  • ½ d x

12 ft


Find area

Find area

9 ft


5 th grade miss cameron s class

Find area

15 mm


5 th grade miss cameron s class

  • Find area

13 cm


5 th grade miss cameron s class

Find area

19 ft


5 th grade miss cameron s class

Circles rap

By Miss Cameron

Circles, those tricky circles! Pow!

I said those circles.

Those tricky circles! Pow!


5 th grade miss cameron s class

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


5 th grade miss cameron s class

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.


5 th grade miss cameron s class

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!


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