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# If the circumference of a circle is less than 10n, which of

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If the circumference of a circle is less than 10n, which of [#permalink]  09 Jun 2018, 08:13
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If the circumference of a circle is less than $$10\pi$$, which of the following could be the area of the circle?

(A) $$20\pi$$

(B) $$25\pi$$

(C) $$36\pi$$

(D) $$81\pi$$

(E) $$100\pi$$
[Reveal] Spoiler: OA

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Re: If the circumference of a circle is less than 10n, which of [#permalink]  09 Jun 2018, 11:57
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Carcass wrote:
If the circumference of a circle is less than $$10\pi$$, which of the following could be the area of the circle?

(A) $$20\pi$$

(B) $$25\pi$$

(C) $$36\pi$$

(D) $$81\pi$$

(E) $$100\pi$$

Given $$2\pi*r$$ < $$10\pi$$

then r < 5,

then we get r as 1,2,3 or 4 ( all integers) and r can't be -ve value.

area of circle with r as 5 = $$25\pi$$, but here r has be less than 5, only option A has such value.

option A.
Re: If the circumference of a circle is less than 10n, which of   [#permalink] 09 Jun 2018, 11:57
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