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Published byCassandra Porter Modified over 6 years ago

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2 Circle A circle is the set of all points that are the same distance from a given point called the center.

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3 Center The given point from which all points on a circle are the same distance.

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4 Circumference The distance around a circle.

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5 Diameter The diameter of a circle is a line segment that joins any two points on the circle and passes through the center of the circle.

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6 Radius The radius of a circle is a line segment joining the center of the circle and any point on the circle.

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7 diameter radius circumference diameter = 2 times radius of diameter radius =

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8 8cm r = d ÷ 2 r = 8 ÷ 2 r = 4 cm 6 yd Find the radius. Find the diameter. d = 2r d = 2۰6 d = 12 yd

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9 The relationship of the circumference and the diameter of a circle is called pi. The symbol for pi is.

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10 Think of fact families Circumference

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11 Circumference WORDS: The circumference of a circle is equal to pi times its diameter or pi times twice its radius. Symbols: or

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12 Circumference Symbols: or

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13 The circumference of a circle is a little more than three times its diameter. The circumference of a circle is a little more than six times its radius.

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14 Use. Find the circumference. 8cm

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15 Use. Find the circumference. 4 ft

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16 Use. Find the circumference. 6 mm 6 x 6

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17 Use. Find the circumference. 7 mm 6 x 7

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