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

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Joined: 02 Sep 2009
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16 Nov 2017, 22:56
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What is the circumference of a circle with radius π?

(A) π
(B) 2π
(C) π^2
(D) 4π
(E) 2π^2
[Reveal] Spoiler: OA

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

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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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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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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 = $$(2)(π)(π)=2(π^2)$$

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

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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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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.

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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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