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Published byCarmel Hunt Modified over 5 years ago

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Mrs. Planavsky 4 th Grade

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Find the circumference of a circle Find the measurement of a diameter of the circle

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The circumference of a circle is the distance around the circle.

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If you know the diameter of a circle, you can estimate its circumference! You can find the EXACT measurement of the circumference of a circle by multiplying the diameter and pi (3.14).

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A diameter is a chord that passes through the center of a circle.

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CircleDiameterEstimated Circumference A2 cm B4 cm C7 cm D8 cm

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12 ft

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How do you know?

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10 cm

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How do you know?

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10 cm..

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How did you figure this one out? What new information did you learn about finding the circumference?

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Half of the diameter is called the radius So, 2 x radius= diameter

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