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Published byDeirdre Clarke Modified over 9 years ago

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Diameter Any line segment that passes through the center of the circle and has endpoints on the circle.

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Diameter A line segment that connects the center of the circle with any point on the circle. TThe radius is equal to half of the diameter.

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Diameter

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Circumference is the distance around a circle. Think of it like the perimeter of a circle. If we know the diameter of a circle we can use the formula C = d to find the circumference.

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Diameter

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This is the amount of surface inside of a circle. If we know the radius of the circle we can determine the area of the circle using the formula A = r 2

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3 cm What is the radius of this circle? What is the Diameter? Use the formula ______ to find the circumference. Use the formula ______ to find the area.

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12 m What is the radius of this circle? What is the Diameter? Use the formula ______ to find the circumference. Use the formula ______ to find the area.

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8 m What is the radius of this circle? What is the Diameter? Use the formula ______ to find the circumference. Use the formula ______ to find the area.

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7 cm What is the radius of this circle? What is the Diameter? Use the formula ______ to find the circumference. Use the formula ______ to find the area.

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11 cm 18cm d = r = C = A = d = r = C = A =

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Diameter For dinner on Friday, you called Nochinno’s asking what their special was that evening. The clerk told you could order a pizza with a diameter of 10in for $9.99 or you could order two 6in pizzas for the same price. Which is the better deal?

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