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**5th Grade Miss Cameron’s Class**

CIRCUMFERENCE 5th Grade Miss Cameron’s Class

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**The circumference of a circle is**

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

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

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**Hint: It is ½ the diameter**

Vocabulary. The radius is the distance from the center of a circle to any point on a circle. Hint: It is ½ the diameter

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**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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**HINT: You may round to the nearest tenth**

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

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

NOW…Let’s have some fun. Tell me what formula would be used to solve the next five problems.

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3in C = 2 x r x 3.14

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8ft C = 3.14 d

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122mm C = 2 x r x 3.14

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17.5 cm C = 3.14 x d

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122.5mm C = 2 x r x 3.14

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

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The answer is: 18.8in 3in C = 2 x 3.14 x r

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8ft C = 3.14 d The answer is: 25.1ft

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122mm C = 2 x 3.14 x d The answer is: mm

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17.5 cm C = 3.14 x d The answer is: 55cm

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122.5mm C = 2 x 3.14 x r The answer is: 76,930mm

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**The amount of space inside.**

Area of a circle= The amount of space inside. r ² 6 m

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Another formula ½ d x 12 ft

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Find area 9 ft

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Find area 15 mm

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Find area 13 cm

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Find area 19 ft

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**Circles rap Circles, those tricky circles! Pow! I said those circles.**

By Miss Cameron Circles, those tricky circles! Pow! I said those circles. Those tricky circles! Pow!

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**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

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

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.

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**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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By Renikki Alexander IDT 7062 Let’s Listen to the Circle Song "πr 2 sounds like area to me and when I need circumference I'll use πd."

By Renikki Alexander IDT 7062 Let’s Listen to the Circle Song "πr 2 sounds like area to me and when I need circumference I'll use πd."

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