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What is Circumference? Write their formula. |
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Answer» The perimeter of a circle is called the circumference of the circle. Using a rape or thread we measure the circumference of a wheel or a bangle. We can also measure the diameter. Diameter is the largest chord of a circle. In each case divide the circumference by the diameter. What do you notice? We find that in each case, the ratio of the circumference to the diameter is the same. This ratio is a constant called π (pi) which is a Greek letter. π= Circumference of circle/Diameter Form this we get the circumference of a circle is the product of π and its diameter. C = πd = 2πr (since d = 2r) |
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