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mekax

  • 4 years ago

WHAT IS THE AREA OF A CIRCLE WITH THE CIRCUMFERENCE OF 31.4CM?

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  1. pottersheep
    • 4 years ago
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    Think about it. Whats the formula for circumference?

  2. Lola9
    • 4 years ago
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    \[circumference = 2 \pi r\]find r then \[area = \pi r^2\]

  3. Harkirat
    • 4 years ago
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    for finding area we need value of radius .... circumference = 2πr Area = πr^2

  4. pottersheep
    • 4 years ago
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    31.4CM =2πr r = 4.99

  5. pottersheep
    • 4 years ago
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    Get it? Cuz 31.4CM divided by 2 divided by π gives you r

  6. pottersheep
    • 4 years ago
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    Round that number to 5.

  7. pottersheep
    • 4 years ago
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    Now plug the new radius into the area formula

  8. pottersheep
    • 4 years ago
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    πr2

  9. pottersheep
    • 4 years ago
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    π5^2

  10. pottersheep
    • 4 years ago
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    = 78.5cm3

  11. robtobey
    • 4 years ago
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    pottersheep has just established that:\[\text{area of a circle}=\frac{c^2}{4 \pi }\]

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