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5 th Grade Miss Camerons Class

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The circumference of a circle is The distance around a circle Hint: Circumference remember circle around. Circumference is a circles perimeter.

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

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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. Circumference = d 3.14 x 4in. 12.6in. WHEN THE CIRCLE HAS A DIAMETER MEASUREMENT, USE THE FOLLOWING FORMULA. 4in.

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Circumference = 2r When the radius of a circle is given, the following formula should be used. 2 x 5cm x cm HINT: You may round to the nearest tenth

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NOW…Lets 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, lets work the problems.

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

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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: 766.2mm

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

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Circumference is perimeter; its all the same They just try to trick you with a name game. Circumference is diameter, the length across Multiplied by pi So dont get lost

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Pi is 3.14, a funny number. Rap with me now, & please dont 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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