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C=2πr is the formula for
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Circumference of a Triangle
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Area of a Circle
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Circumference of a Circle
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None of these
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The formula C=2πr represents the circumference of a circle. The circumference is the distance around the outer edge of a circle. The formula states that the circumference is equal to 2 times pi (approximately 3.14) times the radius of the circle. This formula is commonly used to calculate the length of the boundary of a circle.