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Published byAndrew O’Connor’ Modified over 6 years ago

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10 – 6E CIRCLES

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Important formulas when dealing with circles: Circumference = diameter multiplied by pi or 3.14 C = Circumference = 2 multiplied by the radius multiplied by pi or 3.14 C = Area of a Circle = pi multiplied by the radius squared A = Parts of a Circle: Diameter Radius Chord Circumference

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CIRCUMFERENCE CIRCUMFERENCE IS THE DISTANCE AROUND A CIRCLE LIKE MOLDING IN A ROOM

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AREA AREA INSIDE THE CIRCLE LIKE CARPETING A ROOM

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125.6 = 2(3.14)r 125.6 = 6.28r 6.28 6.28 6.28 6.28 r = 20 cm

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The circle-shaped part of the necklace pendant above has a diameter of 5 mm. The circumference of the circle-shaped part of each of the earrings is one-half the circumference of the circle-shaped part of the necklace pendant. What is the circumference of the circle-shaped part of one of the earrings? Use 3.14 First, find the radius of the circle-shaped part of the necklace pendant Next, use the formula and the radius to find the circumference of the circle-shaped part of the necklace pendant Last, divide the circumference of the circle-shaped part of the necklace pendant by two to find the circumference of the circle-shaped part of one of the earrings the circumference of the circle-shaped part of one of the earrings is 7.85 mm

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