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## Official Guide Explanation:

Data Sufficiency #58

**Background**

This is just one of hundreds of free explanations I've created to the quantitative questions in The Official Guide for GMAT Quantitative Review (2nd ed.). Click the links on the question number, difficulty level, and categories to find explanations for other problems.

These are the same explanations that are featured in my "Guides to the Official Guide" PDF booklets. However, because of the limitations of HTML and cross-browser compatibility, some mathematical concepts, such as fractions and roots, do not display as clearly online.

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**Solution and Metadata**

**Question****: 58**

Page: 157

Difficulty: **5** (Moderate)

Category 1: Geometry > Circles > other

Category 2: Geometry > Lines >

**Explanation:** To find the radius of the circle, you need some other measurement from the circle, such as circumference or area. Statement (1) is insufficient: it offers a ratio, but no number. Statement (2) is also insufficient: it provides information about chord AB, but no numbers.

Taken together, the statements are still insufficient. Without a number for some measurement in the diagram, there is no way to find the radius of the circle. (E) is the correct choice.

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