Chords - GRE Quantitative Reasoning

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Question

Circlechord0

O is the center of the circle above.

The length of is .

Quantity A: The area of the circle.

Quantity B:

Which of the following is true?

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Answer

Circlechord0

O is the center of the circle above.

The length of is .

Quantity A: The area of the circle.

Quantity B:

Do not be tricked by this question. It is true that can be split into halves, each of which are in length. These halves are not, however, radii to the circle. Since this does not go through the center of the circle, its length is shorter than the diameter. This means that the radius of the circle must be greater than . Now, if it were , the area would be . Since it is larger than , the area must be larger than . Quantity A is larger than quantity B.

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