anonymous
  • anonymous
Does anyone know an algebraic expression that gives the area of a circle with a circumference ?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
circumfrance = pi * d
anonymous
  • anonymous
area = p * r^2
anonymous
  • anonymous
ok so A= pi*r^2*d ?

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anonymous
  • anonymous
no i dont' think that there is one for both. you have to use diff. values for each one
anonymous
  • anonymous
ok thanks!
amistre64
  • amistre64
Area of a circle = Circumference times r /2 C = 2pi(r) A = (2pi(r))r/2 A= pi(r^2)
amistre64
  • amistre64
Actually the Area of a sector is equal to its degree in radians times the square of the radius divided by 2. The radian measure of a circle is (2pi). 2pi(r^2)/2 = pi(r^2)
anonymous
  • anonymous
The question for this one says, Enter here an algebraic expression that gives the area of a circle with a circumference . Hint: The circumference of a circle with radius is , and its area is
amistre64
  • amistre64
Algebraic expressions: Circumference = 2pi(r) Area = pi(r^2) When you know the radius, you can solve :)
anonymous
  • anonymous
isnt the radius 1/2
anonymous
  • anonymous
radius = d/2
amistre64
  • amistre64
the radius depends on the size of the circle. And it is half of the width.
anonymous
  • anonymous
yeah so diameter/ 2

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