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mekax

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

  • 2 years ago
  • 2 years ago

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  1. pottersheep
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    Think about it. Whats the formula for circumference?

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

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

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

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

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

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

    • 2 years ago
  8. pottersheep
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    πr2

    • 2 years ago
  9. pottersheep
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    π5^2

    • 2 years ago
  10. pottersheep
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    = 78.5cm3

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

    • 2 years ago
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