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What is the circumference of a circle with radius π?

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What is the circumference of a circle with radius π? [#permalink]

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New post 16 Nov 2017, 22:56
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A
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E

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Re: What is the circumference of a circle with radius π? [#permalink]

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New post 17 Nov 2017, 00:32
Using basic formula, we can find 2Pr=2P^2
E.
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Re: What is the circumference of a circle with radius π? [#permalink]

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New post 17 Nov 2017, 09:19
Bunuel wrote:
What is the circumference of a circle with radius π?

(A) π
(B) 2π
(C) π^2
(D) 4π
(E) 2π^2


Circumference of a circle = \(2πr\)

So, circumference of a circle with radius π = \(2π^2\) ; answer will be (E)
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What is the circumference of a circle with radius π? [#permalink]

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New post 17 Nov 2017, 10:33
Bunuel wrote:
What is the circumference of a circle with radius π?

(A) π
(B) 2π
(C) π^2
(D) 4π
(E) 2π^2

When a variable is also in the formula needed for the answer, I sometimes break the formula down to avoid arithmetic error.

\(r = π\)
Circumference = \(2πr =(2)(π)(r)\)

Circumference = \((2)(π)(π)=2(π^2)\)

Answer E
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Re: What is the circumference of a circle with radius π? [#permalink]

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New post 18 Nov 2017, 02:07
Using the formulae of Circumference of the circle. Answer is 2(π2)
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Re: What is the circumference of a circle with radius π? [#permalink]

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New post 20 Nov 2017, 12:27
Bunuel wrote:
What is the circumference of a circle with radius π?

(A) π
(B) 2π
(C) π^2
(D) 4π
(E) 2π^2


If the radius is π, then the circumference of the circle is 2 x π x π = 2π^2.

Answer: E
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Re: What is the circumference of a circle with radius π?   [#permalink] 20 Nov 2017, 12:27
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