Area List

8 Responses to “What is the area formula for a circle?”

1. Wile E. on March 5th, 2010 at 2:23 am

   π r²
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2. harry m on March 5th, 2010 at 2:55 am

   What is the area formula for a circle?

   = pi * r^2

   QED
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3. KC on March 5th, 2010 at 3:23 am

   π r²
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4. Retsum on March 5th, 2010 at 4:07 am

   pi.r^2
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5. MS. B on March 5th, 2010 at 4:12 am

   A= pi* r^2
   The area is equal to pi times the radius squared. If you do not have the radius, use the diameter. The radius is equal to the diameter divided by 2.
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6. MR SCM on March 5th, 2010 at 4:33 am

   π r² where r is the radius.
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7. michaelempeigne on March 5th, 2010 at 4:55 am

   A = pi*r^2
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   my brain

8. kingofclubs_uk on March 5th, 2010 at 5:12 am

   If you can imagine cutting the circle into really thin sectors – so thin that the curve of the circumference is lost – and you then arrange them one pointing up, one pointing down, one pointing up, one pointing down etc.. You will get a rectangle.

   The vertical side of the rectangle will be equal to the radius. The horizontal sides at the top and bottom will total the circumference (2 pi r)

   As to find area we multiply horizontal by vertical, we only want the value of one horizontal side. 2 pi r / 2 = pi r.

   So area or a circle = pi r x r = pi r^2
   References :

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