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If R is the radius of a certain circle, is the area of this

Expert replies
by BTGmoderatorDC » Tue Aug 28, 2018 4:37 pm

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A

B

C

D

E

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Difficulty

If R is the radius of a certain circle, is the area of this circle greater than the circumference of this circle?

1. 0<R<3
2. The diameter of the circle is greater than 4

OA B

Source: EMPOWERgmat
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Source: — Data Sufficiency |

by Jay@ManhattanReview » Tue Aug 28, 2018 9:36 pm
BTGmoderatorDC wrote:If R is the radius of a certain circle, is the area of this circle greater than the circumference of this circle?

1. 0<R<3
2. The diameter of the circle is greater than 4

OA B

Source: EMPOWERgmat
Area of a circle = πR^2

Circumference of a circle = 2Ï€R

We have to determine whether πR^2 > 2πR

=> R > 2

Question rephrased: Is R > 2?

1. 0 < R < 3

If 0 < R ≤ 2, the answer is no; however, if 2 < R < 3, the answer is yes. No unique answer. Insufficient.

2. The diameter of the circle is greater than 4.

Sufficient.

The correct answer: B

Hope this helps!

-Jay
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If R is the radius of a certain circle, is the NUMERICAL VALUE of the area of this circle greater than the NUMERICAL VALUE of the circumference of this circle?

1. 0 < R < 3
2. The diameter of the circle is greater than 4
\[ \]
Obs.: we cannot compare area and length, but we can compare their corresponding numerical values. That´s why I modified the question stem wording.

\[\pi {r^2}\,\,\mathop > \limits^? \,\,2\pi r\,\,\,\,\,\mathop \Leftrightarrow \limits^{:\,\,\pi r\,\, > \,\,0} \,\,\,\,\boxed{r\,\,\mathop > \limits^? \,\,2}\]
\[\left( 1 \right)\,\,\,\,\,\left\{ \begin{gathered}
\,r = 1\,\,\,\, \Rightarrow \,\,\,\,\left\langle {{\text{NO}}} \right\rangle \hfill \\
\,r = 3\,\,\,\, \Rightarrow \,\,\,\,\left\langle {{\text{YES}}} \right\rangle \hfill \\
\end{gathered} \right.\]
\[\left( 2 \right)\,\,\,2r\,\, > 4\,\,\,\, \Rightarrow \,\,\,\,r > 2\,\,\,\, \Rightarrow \,\,\,\,\left\langle {{\text{YES}}} \right\rangle \,\,\,\,\]

The above follows the notations and rationale taught in the GMATH method.
Fabio Skilnik :: GMATH method creator ( Math for the GMAT)
English-speakers :: https://www.gmath.net
Portuguese-speakers :: https://www.gmath.com.br
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