Find The Relation Between A and C ? If

If the area of a circle is A, radius of the circle is r and circumference of it is C, then

  1. r C = 2 A
  2. A C = r 2/4
  3. C / A = r/2
  4. A/r  C
Anurag Mishra Professor Asked on 12th August 2015 in Maths.
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Answer: (1) r C = 2 A

The area of the circle = A
The radius of the circle = r
And the circumference of the circle = C

The area of the circle = Pai x r2

The circumference of the circle = 2 x pai x r
Then,  r (2 x pai x r) = 2 x Pai x r2

2 x Pai x r2  =2 x Pai x r2

r C = 2 A   (  C  = 2 x pai x r   &  A = Pai x r

Then, the relation between is r C = 2 A

Hence, the answer is (1) r C = 2 A.

Anurag Mishra Professor Answered on 13th August 2015.
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